new upstream release

1 files changed, 3749 insertions, 0 deletions

diff --git a/src/regexec.c b/src/regexec.c
new file mode 100644
index 0000000..2c768e1
--- /dev/null
+++ b/src/regexec.c
@@ -0,0 +1,3749 @@
+/**********************************************************************
+  regexec.c -  Oniguruma (regular expression library)
+**********************************************************************/
+/*-
+ * Copyright (c) 2002-2008  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "regint.h"
+
+#define USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+#define ONIGENC_IS_MBC_CRNL(enc,p,end) \
+  (ONIGENC_MBC_TO_CODE(enc,p,end) == 13 && \
+   ONIGENC_IS_MBC_NEWLINE(enc,(p+enclen(enc,p)),end))
+#endif
+
+#ifdef USE_CAPTURE_HISTORY
+static void history_tree_free(OnigCaptureTreeNode* node);
+
+static void
+history_tree_clear(OnigCaptureTreeNode* node)
+{
+  int i;
+
+  if (IS_NOT_NULL(node)) {
+    for (i = 0; i < node->num_childs; i++) {
+      if (IS_NOT_NULL(node->childs[i])) {
+        history_tree_free(node->childs[i]);
+      }
+    }
+    for (i = 0; i < node->allocated; i++) {
+      node->childs[i] = (OnigCaptureTreeNode* )0;
+    }
+    node->num_childs = 0;
+    node->beg = ONIG_REGION_NOTPOS;
+    node->end = ONIG_REGION_NOTPOS;
+    node->group = -1;
+  }
+}
+
+static void
+history_tree_free(OnigCaptureTreeNode* node)
+{
+  history_tree_clear(node);
+  xfree(node);
+}
+
+static void
+history_root_free(OnigRegion* r)
+{
+  if (IS_NOT_NULL(r->history_root)) {
+    history_tree_free(r->history_root);
+    r->history_root = (OnigCaptureTreeNode* )0;
+  }
+}
+
+static OnigCaptureTreeNode*
+history_node_new(void)
+{
+  OnigCaptureTreeNode* node;
+
+  node = (OnigCaptureTreeNode* )xmalloc(sizeof(OnigCaptureTreeNode));
+  CHECK_NULL_RETURN(node);
+  node->childs     = (OnigCaptureTreeNode** )0;
+  node->allocated  = 0;
+  node->num_childs = 0;
+  node->group      = -1;
+  node->beg        = ONIG_REGION_NOTPOS;
+  node->end        = ONIG_REGION_NOTPOS;
+
+  return node;
+}
+
+static int
+history_tree_add_child(OnigCaptureTreeNode* parent, OnigCaptureTreeNode* child)
+{
+#define HISTORY_TREE_INIT_ALLOC_SIZE  8
+
+  if (parent->num_childs >= parent->allocated) {
+    int n, i;
+
+    if (IS_NULL(parent->childs)) {
+      n = HISTORY_TREE_INIT_ALLOC_SIZE;
+      parent->childs =
+        (OnigCaptureTreeNode** )xmalloc(sizeof(OnigCaptureTreeNode*) * n);
+    }
+    else {
+      n = parent->allocated * 2;
+      parent->childs =
+        (OnigCaptureTreeNode** )xrealloc(parent->childs,
+                                         sizeof(OnigCaptureTreeNode*) * n);
+    }
+    CHECK_NULL_RETURN_MEMERR(parent->childs);
+    for (i = parent->allocated; i < n; i++) {
+      parent->childs[i] = (OnigCaptureTreeNode* )0;
+    }
+    parent->allocated = n;
+  }
+
+  parent->childs[parent->num_childs] = child;
+  parent->num_childs++;
+  return 0;
+}
+
+static OnigCaptureTreeNode*
+history_tree_clone(OnigCaptureTreeNode* node)
+{
+  int i;
+  OnigCaptureTreeNode *clone, *child;
+
+  clone = history_node_new();
+  CHECK_NULL_RETURN(clone);
+
+  clone->beg = node->beg;
+  clone->end = node->end;
+  for (i = 0; i < node->num_childs; i++) {
+    child = history_tree_clone(node->childs[i]);
+    if (IS_NULL(child)) {
+      history_tree_free(clone);
+      return (OnigCaptureTreeNode* )0;
+    }
+    history_tree_add_child(clone, child);
+  }
+
+  return clone;
+}
+
+extern  OnigCaptureTreeNode*
+onig_get_capture_tree(OnigRegion* region)
+{
+  return region->history_root;
+}
+#endif /* USE_CAPTURE_HISTORY */
+
+extern void
+onig_region_clear(OnigRegion* region)
+{
+  int i;
+
+  for (i = 0; i < region->num_regs; i++) {
+    region->beg[i] = region->end[i] = ONIG_REGION_NOTPOS;
+  }
+#ifdef USE_CAPTURE_HISTORY
+  history_root_free(region);
+#endif
+}
+
+extern int
+onig_region_resize(OnigRegion* region, int n)
+{
+  region->num_regs = n;
+
+  if (n < ONIG_NREGION)
+    n = ONIG_NREGION;
+
+  if (region->allocated == 0) {
+    region->beg = (int* )xmalloc(n * sizeof(int));
+    region->end = (int* )xmalloc(n * sizeof(int));
+
+    if (region->beg == 0 || region->end == 0)
+      return ONIGERR_MEMORY;
+
+    region->allocated = n;
+  }
+  else if (region->allocated < n) {
+    region->beg = (int* )xrealloc(region->beg, n * sizeof(int));
+    region->end = (int* )xrealloc(region->end, n * sizeof(int));
+
+    if (region->beg == 0 || region->end == 0)
+      return ONIGERR_MEMORY;
+
+    region->allocated = n;
+  }
+
+  return 0;
+}
+
+static int
+onig_region_resize_clear(OnigRegion* region, int n)
+{
+  int r;
+  
+  r = onig_region_resize(region, n);
+  if (r != 0) return r;
+  onig_region_clear(region);
+  return 0;
+}
+    
+extern int
+onig_region_set(OnigRegion* region, int at, int beg, int end)
+{
+  if (at < 0) return ONIGERR_INVALID_ARGUMENT;
+
+  if (at >= region->allocated) {
+    int r = onig_region_resize(region, at + 1);
+    if (r < 0) return r;
+  }
+  
+  region->beg[at] = beg;
+  region->end[at] = end;
+  return 0;
+}
+
+extern void
+onig_region_init(OnigRegion* region)
+{
+  region->num_regs     = 0;
+  region->allocated    = 0;
+  region->beg          = (int* )0;
+  region->end          = (int* )0;
+  region->history_root = (OnigCaptureTreeNode* )0;
+}
+
+extern OnigRegion*
+onig_region_new(void)
+{
+  OnigRegion* r;
+
+  r = (OnigRegion* )xmalloc(sizeof(OnigRegion));
+  onig_region_init(r);
+  return r;
+}
+
+extern void
+onig_region_free(OnigRegion* r, int free_self)
+{
+  if (r) {
+    if (r->allocated > 0) {
+      if (r->beg) xfree(r->beg);
+      if (r->end) xfree(r->end);
+      r->allocated = 0;
+    }
+#ifdef USE_CAPTURE_HISTORY
+    history_root_free(r);
+#endif
+    if (free_self) xfree(r);
+  }
+}
+
+extern void
+onig_region_copy(OnigRegion* to, OnigRegion* from)
+{
+#define RREGC_SIZE   (sizeof(int) * from->num_regs)
+  int i;
+
+  if (to == from) return;
+
+  if (to->allocated == 0) {
+    if (from->num_regs > 0) {
+      to->beg = (int* )xmalloc(RREGC_SIZE);
+      to->end = (int* )xmalloc(RREGC_SIZE);
+      to->allocated = from->num_regs;
+    }
+  }
+  else if (to->allocated < from->num_regs) {
+    to->beg = (int* )xrealloc(to->beg, RREGC_SIZE);
+    to->end = (int* )xrealloc(to->end, RREGC_SIZE);
+    to->allocated = from->num_regs;
+  }
+
+  for (i = 0; i < from->num_regs; i++) {
+    to->beg[i] = from->beg[i];
+    to->end[i] = from->end[i];
+  }
+  to->num_regs = from->num_regs;
+
+#ifdef USE_CAPTURE_HISTORY
+  history_root_free(to);
+
+  if (IS_NOT_NULL(from->history_root)) {
+    to->history_root = history_tree_clone(from->history_root);
+  }
+#endif
+}
+
+
+/** stack **/
+#define INVALID_STACK_INDEX   -1
+
+/* stack type */
+/* used by normal-POP */
+#define STK_ALT                    0x0001
+#define STK_LOOK_BEHIND_NOT        0x0002
+#define STK_POS_NOT                0x0003
+/* handled by normal-POP */
+#define STK_MEM_START              0x0100
+#define STK_MEM_END                0x8200
+#define STK_REPEAT_INC             0x0300
+#define STK_STATE_CHECK_MARK       0x1000
+/* avoided by normal-POP */
+#define STK_NULL_CHECK_START       0x3000
+#define STK_NULL_CHECK_END         0x5000  /* for recursive call */
+#define STK_MEM_END_MARK           0x8400
+#define STK_POS                    0x0500  /* used when POP-POS */
+#define STK_STOP_BT                0x0600  /* mark for "(?>...)" */
+#define STK_REPEAT                 0x0700
+#define STK_CALL_FRAME             0x0800
+#define STK_RETURN                 0x0900
+#define STK_VOID                   0x0a00  /* for fill a blank */
+
+/* stack type check mask */
+#define STK_MASK_POP_USED          0x00ff
+#define STK_MASK_TO_VOID_TARGET    0x10ff
+#define STK_MASK_MEM_END_OR_MARK   0x8000  /* MEM_END or MEM_END_MARK */
+
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+#define MATCH_ARG_INIT(msa, arg_option, arg_region, arg_start) do {\
+  (msa).stack_p  = (void* )0;\
+  (msa).options  = (arg_option);\
+  (msa).region   = (arg_region);\
+  (msa).start    = (arg_start);\
+  (msa).best_len = ONIG_MISMATCH;\
+} while(0)
+#else
+#define MATCH_ARG_INIT(msa, arg_option, arg_region, arg_start) do {\
+  (msa).stack_p  = (void* )0;\
+  (msa).options  = (arg_option);\
+  (msa).region   = (arg_region);\
+  (msa).start    = (arg_start);\
+} while(0)
+#endif
+
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+
+#define STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE  16
+
+#define STATE_CHECK_BUFF_INIT(msa, str_len, offset, state_num) do {	\
+  if ((state_num) > 0 && str_len >= STATE_CHECK_STRING_THRESHOLD_LEN) {\
+    unsigned int size = (unsigned int )(((str_len) + 1) * (state_num) + 7) >> 3;\
+    offset = ((offset) * (state_num)) >> 3;\
+    if (size > 0 && offset < size && size < STATE_CHECK_BUFF_MAX_SIZE) {\
+      if (size >= STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE) \
+        (msa).state_check_buff = (void* )xmalloc(size);\
+      else \
+        (msa).state_check_buff = (void* )xalloca(size);\
+      xmemset(((char* )((msa).state_check_buff)+(offset)), 0, \
+              (size_t )(size - (offset))); \
+      (msa).state_check_buff_size = size;\
+    }\
+    else {\
+      (msa).state_check_buff = (void* )0;\
+      (msa).state_check_buff_size = 0;\
+    }\
+  }\
+  else {\
+    (msa).state_check_buff = (void* )0;\
+    (msa).state_check_buff_size = 0;\
+  }\
+  } while(0)
+
+#define MATCH_ARG_FREE(msa) do {\
+  if ((msa).stack_p) xfree((msa).stack_p);\
+  if ((msa).state_check_buff_size >= STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE) { \
+    if ((msa).state_check_buff) xfree((msa).state_check_buff);\
+  }\
+} while(0)
+#else
+#define STATE_CHECK_BUFF_INIT(msa, str_len, offset, state_num)
+#define MATCH_ARG_FREE(msa)  if ((msa).stack_p) xfree((msa).stack_p)
+#endif
+
+
+
+#define STACK_INIT(alloc_addr, ptr_num, stack_num)  do {\
+  if (msa->stack_p) {\
+    alloc_addr = (char* )xalloca(sizeof(char*) * (ptr_num));\
+    stk_alloc  = (OnigStackType* )(msa->stack_p);\
+    stk_base   = stk_alloc;\
+    stk        = stk_base;\
+    stk_end    = stk_base + msa->stack_n;\
+  }\
+  else {\
+    alloc_addr = (char* )xalloca(sizeof(char*) * (ptr_num)\
+		       + sizeof(OnigStackType) * (stack_num));\
+    stk_alloc  = (OnigStackType* )(alloc_addr + sizeof(char*) * (ptr_num));\
+    stk_base   = stk_alloc;\
+    stk        = stk_base;\
+    stk_end    = stk_base + (stack_num);\
+  }\
+} while(0)
+
+#define STACK_SAVE do{\
+  if (stk_base != stk_alloc) {\
+    msa->stack_p = stk_base;\
+    msa->stack_n = stk_end - stk_base;\
+  };\
+} while(0)
+
+static unsigned int MatchStackLimitSize = DEFAULT_MATCH_STACK_LIMIT_SIZE;
+
+extern unsigned int
+onig_get_match_stack_limit_size(void)
+{
+  return MatchStackLimitSize;
+}
+
+extern int
+onig_set_match_stack_limit_size(unsigned int size)
+{
+  MatchStackLimitSize = size;
+  return 0;
+}
+
+static int
+stack_double(OnigStackType** arg_stk_base, OnigStackType** arg_stk_end,
+	     OnigStackType** arg_stk, OnigStackType* stk_alloc, OnigMatchArg* msa)
+{
+  unsigned int n;
+  OnigStackType *x, *stk_base, *stk_end, *stk;
+
+  stk_base = *arg_stk_base;
+  stk_end  = *arg_stk_end;
+  stk      = *arg_stk;
+
+  n = stk_end - stk_base;
+  if (stk_base == stk_alloc && IS_NULL(msa->stack_p)) {
+    x = (OnigStackType* )xmalloc(sizeof(OnigStackType) * n * 2);
+    if (IS_NULL(x)) {
+      STACK_SAVE;
+      return ONIGERR_MEMORY;
+    }
+    xmemcpy(x, stk_base, n * sizeof(OnigStackType));
+    n *= 2;
+  }
+  else {
+    n *= 2;
+    if (MatchStackLimitSize != 0 && n > MatchStackLimitSize) {
+      if ((unsigned int )(stk_end - stk_base) == MatchStackLimitSize)
+        return ONIGERR_MATCH_STACK_LIMIT_OVER;
+      else
+        n = MatchStackLimitSize;
+    }
+    x = (OnigStackType* )xrealloc(stk_base, sizeof(OnigStackType) * n);
+    if (IS_NULL(x)) {
+      STACK_SAVE;
+      return ONIGERR_MEMORY;
+    }
+  }
+  *arg_stk      = x + (stk - stk_base);
+  *arg_stk_base = x;
+  *arg_stk_end  = x + n;
+  return 0;
+}
+
+#define STACK_ENSURE(n)	do {\
+  if (stk_end - stk < (n)) {\
+    int r = stack_double(&stk_base, &stk_end, &stk, stk_alloc, msa);\
+    if (r != 0) { STACK_SAVE; return r; } \
+  }\
+} while(0)
+
+#define STACK_AT(index)        (stk_base + (index))
+#define GET_STACK_INDEX(stk)   ((stk) - stk_base)
+
+#define STACK_PUSH_TYPE(stack_type) do {\
+  STACK_ENSURE(1);\
+  stk->type = (stack_type);\
+  STACK_INC;\
+} while(0)
+
+#define IS_TO_VOID_TARGET(stk) (((stk)->type & STK_MASK_TO_VOID_TARGET) != 0)
+
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+#define STATE_CHECK_POS(s,snum) \
+  (((s) - str) * num_comb_exp_check + ((snum) - 1))
+#define STATE_CHECK_VAL(v,snum) do {\
+  if (state_check_buff != NULL) {\
+    int x = STATE_CHECK_POS(s,snum);\
+    (v) = state_check_buff[x/8] & (1<<(x%8));\
+  }\
+  else (v) = 0;\
+} while(0)
+
+
+#define ELSE_IF_STATE_CHECK_MARK(stk) \
+  else if ((stk)->type == STK_STATE_CHECK_MARK) { \
+    int x = STATE_CHECK_POS(stk->u.state.pstr, stk->u.state.state_check);\
+    state_check_buff[x/8] |= (1<<(x%8));				\
+  }
+
+#define STACK_PUSH(stack_type,pat,s,sprev) do {\
+  STACK_ENSURE(1);\
+  stk->type = (stack_type);\
+  stk->u.state.pcode     = (pat);\
+  stk->u.state.pstr      = (s);\
+  stk->u.state.pstr_prev = (sprev);\
+  stk->u.state.state_check = 0;\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_ENSURED(stack_type,pat) do {\
+  stk->type = (stack_type);\
+  stk->u.state.pcode = (pat);\
+  stk->u.state.state_check = 0;\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_ALT_WITH_STATE_CHECK(pat,s,sprev,snum) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_ALT;\
+  stk->u.state.pcode     = (pat);\
+  stk->u.state.pstr      = (s);\
+  stk->u.state.pstr_prev = (sprev);\
+  stk->u.state.state_check = ((state_check_buff != NULL) ? (snum) : 0);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_STATE_CHECK(s,snum) do {\
+  if (state_check_buff != NULL) {\
+    STACK_ENSURE(1);\
+    stk->type = STK_STATE_CHECK_MARK;\
+    stk->u.state.pstr = (s);\
+    stk->u.state.state_check = (snum);\
+    STACK_INC;\
+  }\
+} while(0)
+
+#else /* USE_COMBINATION_EXPLOSION_CHECK */
+
+#define ELSE_IF_STATE_CHECK_MARK(stk)
+
+#define STACK_PUSH(stack_type,pat,s,sprev) do {\
+  STACK_ENSURE(1);\
+  stk->type = (stack_type);\
+  stk->u.state.pcode     = (pat);\
+  stk->u.state.pstr      = (s);\
+  stk->u.state.pstr_prev = (sprev);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_ENSURED(stack_type,pat) do {\
+  stk->type = (stack_type);\
+  stk->u.state.pcode = (pat);\
+  STACK_INC;\
+} while(0)
+#endif /* USE_COMBINATION_EXPLOSION_CHECK */
+
+#define STACK_PUSH_ALT(pat,s,sprev)     STACK_PUSH(STK_ALT,pat,s,sprev)
+#define STACK_PUSH_POS(s,sprev)         STACK_PUSH(STK_POS,NULL_UCHARP,s,sprev)
+#define STACK_PUSH_POS_NOT(pat,s,sprev) STACK_PUSH(STK_POS_NOT,pat,s,sprev)
+#define STACK_PUSH_STOP_BT              STACK_PUSH_TYPE(STK_STOP_BT)
+#define STACK_PUSH_LOOK_BEHIND_NOT(pat,s,sprev) \
+        STACK_PUSH(STK_LOOK_BEHIND_NOT,pat,s,sprev)
+
+#define STACK_PUSH_REPEAT(id, pat) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_REPEAT;\
+  stk->u.repeat.num    = (id);\
+  stk->u.repeat.pcode  = (pat);\
+  stk->u.repeat.count  = 0;\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_REPEAT_INC(sindex) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_REPEAT_INC;\
+  stk->u.repeat_inc.si  = (sindex);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_MEM_START(mnum, s) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_MEM_START;\
+  stk->u.mem.num      = (mnum);\
+  stk->u.mem.pstr     = (s);\
+  stk->u.mem.start    = mem_start_stk[mnum];\
+  stk->u.mem.end      = mem_end_stk[mnum];\
+  mem_start_stk[mnum] = GET_STACK_INDEX(stk);\
+  mem_end_stk[mnum]   = INVALID_STACK_INDEX;\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_MEM_END(mnum, s) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_MEM_END;\
+  stk->u.mem.num    = (mnum);\
+  stk->u.mem.pstr   = (s);\
+  stk->u.mem.start  = mem_start_stk[mnum];\
+  stk->u.mem.end    = mem_end_stk[mnum];\
+  mem_end_stk[mnum] = GET_STACK_INDEX(stk);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_MEM_END_MARK(mnum) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_MEM_END_MARK;\
+  stk->u.mem.num = (mnum);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_GET_MEM_START(mnum, k) do {\
+  int level = 0;\
+  k = stk;\
+  while (k > stk_base) {\
+    k--;\
+    if ((k->type & STK_MASK_MEM_END_OR_MARK) != 0 \
+      && k->u.mem.num == (mnum)) {\
+      level++;\
+    }\
+    else if (k->type == STK_MEM_START && k->u.mem.num == (mnum)) {\
+      if (level == 0) break;\
+      level--;\
+    }\
+  }\
+} while(0)
+
+#define STACK_GET_MEM_RANGE(k, mnum, start, end) do {\
+  int level = 0;\
+  while (k < stk) {\
+    if (k->type == STK_MEM_START && k->u.mem.num == (mnum)) {\
+      if (level == 0) (start) = k->u.mem.pstr;\
+      level++;\
+    }\
+    else if (k->type == STK_MEM_END && k->u.mem.num == (mnum)) {\
+      level--;\
+      if (level == 0) {\
+        (end) = k->u.mem.pstr;\
+        break;\
+      }\
+    }\
+    k++;\
+  }\
+} while(0)
+
+#define STACK_PUSH_NULL_CHECK_START(cnum, s) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_NULL_CHECK_START;\
+  stk->u.null_check.num  = (cnum);\
+  stk->u.null_check.pstr = (s);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_NULL_CHECK_END(cnum) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_NULL_CHECK_END;\
+  stk->u.null_check.num  = (cnum);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_CALL_FRAME(pat) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_CALL_FRAME;\
+  stk->u.call_frame.ret_addr = (pat);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_RETURN do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_RETURN;\
+  STACK_INC;\
+} while(0)
+
+
+#ifdef ONIG_DEBUG
+#define STACK_BASE_CHECK(p, at) \
+  if ((p) < stk_base) {\
+    fprintf(stderr, "at %s\n", at);\
+    goto stack_error;\
+  }
+#else
+#define STACK_BASE_CHECK(p, at)
+#endif
+
+#define STACK_POP_ONE do {\
+  stk--;\
+  STACK_BASE_CHECK(stk, "STACK_POP_ONE"); \
+} while(0)
+
+#define STACK_POP  do {\
+  switch (pop_level) {\
+  case STACK_POP_LEVEL_FREE:\
+    while (1) {\
+      stk--;\
+      STACK_BASE_CHECK(stk, "STACK_POP"); \
+      if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
+      ELSE_IF_STATE_CHECK_MARK(stk);\
+    }\
+    break;\
+  case STACK_POP_LEVEL_MEM_START:\
+    while (1) {\
+      stk--;\
+      STACK_BASE_CHECK(stk, "STACK_POP 2"); \
+      if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
+      else if (stk->type == STK_MEM_START) {\
+        mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+        mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+      }\
+      ELSE_IF_STATE_CHECK_MARK(stk);\
+    }\
+    break;\
+  default:\
+    while (1) {\
+      stk--;\
+      STACK_BASE_CHECK(stk, "STACK_POP 3"); \
+      if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
+      else if (stk->type == STK_MEM_START) {\
+        mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+        mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+      }\
+      else if (stk->type == STK_REPEAT_INC) {\
+        STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
+      }\
+      else if (stk->type == STK_MEM_END) {\
+        mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+        mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+      }\
+      ELSE_IF_STATE_CHECK_MARK(stk);\
+    }\
+    break;\
+  }\
+} while(0)
+
+#define STACK_POP_TIL_POS_NOT  do {\
+  while (1) {\
+    stk--;\
+    STACK_BASE_CHECK(stk, "STACK_POP_TIL_POS_NOT"); \
+    if (stk->type == STK_POS_NOT) break;\
+    else if (stk->type == STK_MEM_START) {\
+      mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+      mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+    }\
+    else if (stk->type == STK_REPEAT_INC) {\
+      STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
+    }\
+    else if (stk->type == STK_MEM_END) {\
+      mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+      mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+    }\
+    ELSE_IF_STATE_CHECK_MARK(stk);\
+  }\
+} while(0)
+
+#define STACK_POP_TIL_LOOK_BEHIND_NOT  do {\
+  while (1) {\
+    stk--;\
+    STACK_BASE_CHECK(stk, "STACK_POP_TIL_LOOK_BEHIND_NOT"); \
+    if (stk->type == STK_LOOK_BEHIND_NOT) break;\
+    else if (stk->type == STK_MEM_START) {\
+      mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+      mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+    }\
+    else if (stk->type == STK_REPEAT_INC) {\
+      STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
+    }\
+    else if (stk->type == STK_MEM_END) {\
+      mem_start_stk[stk->u.mem.num] = stk->u.mem.start;\
+      mem_end_stk[stk->u.mem.num]   = stk->u.mem.end;\
+    }\
+    ELSE_IF_STATE_CHECK_MARK(stk);\
+  }\
+} while(0)
+
+#define STACK_POS_END(k) do {\
+  k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_POS_END"); \
+    if (IS_TO_VOID_TARGET(k)) {\
+      k->type = STK_VOID;\
+    }\
+    else if (k->type == STK_POS) {\
+      k->type = STK_VOID;\
+      break;\
+    }\
+  }\
+} while(0)
+
+#define STACK_STOP_BT_END do {\
+  OnigStackType *k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_STOP_BT_END"); \
+    if (IS_TO_VOID_TARGET(k)) {\
+      k->type = STK_VOID;\
+    }\
+    else if (k->type == STK_STOP_BT) {\
+      k->type = STK_VOID;\
+      break;\
+    }\
+  }\
+} while(0)
+
+#define STACK_NULL_CHECK(isnull,id,s) do {\
+  OnigStackType* k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_NULL_CHECK"); \
+    if (k->type == STK_NULL_CHECK_START) {\
+      if (k->u.null_check.num == (id)) {\
+        (isnull) = (k->u.null_check.pstr == (s));\
+        break;\
+      }\
+    }\
+  }\
+} while(0)
+
+#define STACK_NULL_CHECK_REC(isnull,id,s) do {\
+  int level = 0;\
+  OnigStackType* k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_NULL_CHECK_REC"); \
+    if (k->type == STK_NULL_CHECK_START) {\
+      if (k->u.null_check.num == (id)) {\
+        if (level == 0) {\
+          (isnull) = (k->u.null_check.pstr == (s));\
+          break;\
+        }\
+        else level--;\
+      }\
+    }\
+    else if (k->type == STK_NULL_CHECK_END) {\
+      level++;\
+    }\
+  }\
+} while(0)
+
+#define STACK_NULL_CHECK_MEMST(isnull,id,s,reg) do {\
+  OnigStackType* k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_NULL_CHECK_MEMST"); \
+    if (k->type == STK_NULL_CHECK_START) {\
+      if (k->u.null_check.num == (id)) {\
+        if (k->u.null_check.pstr != (s)) {\
+          (isnull) = 0;\
+          break;\
+        }\
+        else {\
+          UChar* endp;\
+          (isnull) = 1;\
+          while (k < stk) {\
+            if (k->type == STK_MEM_START) {\
+              if (k->u.mem.end == INVALID_STACK_INDEX) {\
+                (isnull) = 0; break;\
+              }\
+              if (BIT_STATUS_AT(reg->bt_mem_end, k->u.mem.num))\
+                endp = STACK_AT(k->u.mem.end)->u.mem.pstr;\
+              else\
+                endp = (UChar* )k->u.mem.end;\
+              if (STACK_AT(k->u.mem.start)->u.mem.pstr != endp) {\
+                (isnull) = 0; break;\
+              }\
+              else if (endp != s) {\
+                (isnull) = -1; /* empty, but position changed */ \
+              }\
+            }\
+            k++;\
+          }\
+  	  break;\
+        }\
+      }\
+    }\
+  }\
+} while(0)
+
+#define STACK_NULL_CHECK_MEMST_REC(isnull,id,s,reg) do {\
+  int level = 0;\
+  OnigStackType* k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_NULL_CHECK_MEMST_REC"); \
+    if (k->type == STK_NULL_CHECK_START) {\
+      if (k->u.null_check.num == (id)) {\
+        if (level == 0) {\
+          if (k->u.null_check.pstr != (s)) {\
+            (isnull) = 0;\
+            break;\
+          }\
+          else {\
+            UChar* endp;\
+            (isnull) = 1;\
+            while (k < stk) {\
+              if (k->type == STK_MEM_START) {\
+                if (k->u.mem.end == INVALID_STACK_INDEX) {\
+                  (isnull) = 0; break;\
+                }\
+                if (BIT_STATUS_AT(reg->bt_mem_end, k->u.mem.num))\
+                  endp = STACK_AT(k->u.mem.end)->u.mem.pstr;\
+                else\
+                  endp = (UChar* )k->u.mem.end;\
+                if (STACK_AT(k->u.mem.start)->u.mem.pstr != endp) {\
+                  (isnull) = 0; break;\
+                }\
+                else if (endp != s) {\
+                  (isnull) = -1; /* empty, but position changed */ \
+                }\
+              }\
+              k++;\
+            }\
+  	    break;\
+          }\
+        }\
+        else {\
+          level--;\
+        }\
+      }\
+    }\
+    else if (k->type == STK_NULL_CHECK_END) {\
+      if (k->u.null_check.num == (id)) level++;\
+    }\
+  }\
+} while(0)
+
+#define STACK_GET_REPEAT(id, k) do {\
+  int level = 0;\
+  k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_GET_REPEAT"); \
+    if (k->type == STK_REPEAT) {\
+      if (level == 0) {\
+        if (k->u.repeat.num == (id)) {\
+          break;\
+        }\
+      }\
+    }\
+    else if (k->type == STK_CALL_FRAME) level--;\
+    else if (k->type == STK_RETURN)     level++;\
+  }\
+} while(0)
+
+#define STACK_RETURN(addr)  do {\
+  int level = 0;\
+  OnigStackType* k = stk;\
+  while (1) {\
+    k--;\
+    STACK_BASE_CHECK(k, "STACK_RETURN"); \
+    if (k->type == STK_CALL_FRAME) {\
+      if (level == 0) {\
+        (addr) = k->u.call_frame.ret_addr;\
+        break;\
+      }\
+      else level--;\
+    }\
+    else if (k->type == STK_RETURN)\
+      level++;\
+  }\
+} while(0)
+
+
+#define STRING_CMP(s1,s2,len) do {\
+  while (len-- > 0) {\
+    if (*s1++ != *s2++) goto fail;\
+  }\
+} while(0)
+
+#define STRING_CMP_IC(case_fold_flag,s1,ps2,len) do {\
+  if (string_cmp_ic(encode, case_fold_flag, s1, ps2, len) == 0) \
+    goto fail; \
+} while(0)
+
+static int string_cmp_ic(OnigEncoding enc, int case_fold_flag,
+			 UChar* s1, UChar** ps2, int mblen)
+{
+  UChar buf1[ONIGENC_MBC_CASE_FOLD_MAXLEN];
+  UChar buf2[ONIGENC_MBC_CASE_FOLD_MAXLEN];
+  UChar *p1, *p2, *end1, *s2, *end2;
+  int len1, len2;
+
+  s2   = *ps2;
+  end1 = s1 + mblen;
+  end2 = s2 + mblen;
+  while (s1 < end1) {
+    len1 = ONIGENC_MBC_CASE_FOLD(enc, case_fold_flag, &s1, end1, buf1);
+    len2 = ONIGENC_MBC_CASE_FOLD(enc, case_fold_flag, &s2, end2, buf2);
+    if (len1 != len2) return 0;
+    p1 = buf1;
+    p2 = buf2;
+    while (len1-- > 0) {
+      if (*p1 != *p2) return 0;
+      p1++;
+      p2++;
+    }
+  }
+
+  *ps2 = s2;
+  return 1;
+}
+
+#define STRING_CMP_VALUE(s1,s2,len,is_fail) do {\
+  is_fail = 0;\
+  while (len-- > 0) {\
+    if (*s1++ != *s2++) {\
+      is_fail = 1; break;\
+    }\
+  }\
+} while(0)
+
+#define STRING_CMP_VALUE_IC(case_fold_flag,s1,ps2,len,is_fail) do {\
+  if (string_cmp_ic(encode, case_fold_flag, s1, ps2, len) == 0) \
+    is_fail = 1; \
+  else \
+    is_fail = 0; \
+} while(0)
+
+
+#define IS_EMPTY_STR           (str == end)
+#define ON_STR_BEGIN(s)       ((s) == str)
+#define ON_STR_END(s)         ((s) == end)
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+#define DATA_ENSURE_CHECK1     (s < right_range)
+#define DATA_ENSURE_CHECK(n)   (s + (n) <= right_range)
+#define DATA_ENSURE(n)         if (s + (n) > right_range) goto fail
+#else
+#define DATA_ENSURE_CHECK1     (s < end)
+#define DATA_ENSURE_CHECK(n)   (s + (n) <= end)
+#define DATA_ENSURE(n)         if (s + (n) > end) goto fail
+#endif /* USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE */
+
+
+#ifdef USE_CAPTURE_HISTORY
+static int
+make_capture_history_tree(OnigCaptureTreeNode* node, OnigStackType** kp,
+                          OnigStackType* stk_top, UChar* str, regex_t* reg)
+{
+  int n, r;
+  OnigCaptureTreeNode* child;
+  OnigStackType* k = *kp;
+
+  while (k < stk_top) {
+    if (k->type == STK_MEM_START) {
+      n = k->u.mem.num;
+      if (n <= ONIG_MAX_CAPTURE_HISTORY_GROUP &&
+          BIT_STATUS_AT(reg->capture_history, n) != 0) {
+        child = history_node_new();
+        CHECK_NULL_RETURN_MEMERR(child);
+        child->group = n;
+        child->beg = (int )(k->u.mem.pstr - str);
+        r = history_tree_add_child(node, child);
+        if (r != 0) return r;
+        *kp = (k + 1);
+        r = make_capture_history_tree(child, kp, stk_top, str, reg);
+        if (r != 0) return r;
+
+        k = *kp;
+        child->end = (int )(k->u.mem.pstr - str);
+      }
+    }
+    else if (k->type == STK_MEM_END) {
+      if (k->u.mem.num == node->group) {
+        node->end = (int )(k->u.mem.pstr - str);
+        *kp = k;
+        return 0;
+      }
+    }
+    k++;
+  }
+
+  return 1; /* 1: root node ending. */
+}
+#endif
+
+#ifdef USE_BACKREF_WITH_LEVEL
+static int mem_is_in_memp(int mem, int num, UChar* memp)
+{
+  int i;
+  MemNumType m;
+
+  for (i = 0; i < num; i++) {
+    GET_MEMNUM_INC(m, memp);
+    if (mem == (int )m) return 1;
+  }
+  return 0;
+}
+
+static int backref_match_at_nested_level(regex_t* reg
+	 , OnigStackType* top, OnigStackType* stk_base
+	 , int ignore_case, int case_fold_flag
+	 , int nest, int mem_num, UChar* memp, UChar** s, const UChar* send)
+{
+  UChar *ss, *p, *pstart, *pend = NULL_UCHARP;
+  int level;
+  OnigStackType* k;
+
+  level = 0;
+  k = top;
+  k--;
+  while (k >= stk_base) {
+    if (k->type == STK_CALL_FRAME) {
+      level--;
+    }
+    else if (k->type == STK_RETURN) {
+      level++;
+    }
+    else if (level == nest) {
+      if (k->type == STK_MEM_START) {
+	if (mem_is_in_memp(k->u.mem.num, mem_num, memp)) {
+	  pstart = k->u.mem.pstr;
+	  if (pend != NULL_UCHARP) {
+	    if (pend - pstart > send - *s) return 0; /* or goto next_mem; */
+	    p  = pstart;
+	    ss = *s;
+
+	    if (ignore_case != 0) {
+	      if (string_cmp_ic(reg->enc, case_fold_flag,
+				pstart, &ss, (int )(pend - pstart)) == 0)
+		return 0; /* or goto next_mem; */
+	    }
+	    else {
+	      while (p < pend) {
+		if (*p++ != *ss++) return 0; /* or goto next_mem; */
+	      }
+	    }
+
+	    *s = ss;
+	    return 1;
+	  }
+	}
+      }
+      else if (k->type == STK_MEM_END) {
+	if (mem_is_in_memp(k->u.mem.num, mem_num, memp)) {
+	  pend = k->u.mem.pstr;
+	}
+      }
+    }
+    k--;
+  }
+
+  return 0;
+}
+#endif /* USE_BACKREF_WITH_LEVEL */
+
+
+#ifdef ONIG_DEBUG_STATISTICS
+
+#define USE_TIMEOFDAY
+
+#ifdef USE_TIMEOFDAY
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+static struct timeval ts, te;
+#define GETTIME(t)        gettimeofday(&(t), (struct timezone* )0)
+#define TIMEDIFF(te,ts)   (((te).tv_usec - (ts).tv_usec) + \
+                           (((te).tv_sec - (ts).tv_sec)*1000000))
+#else
+#ifdef HAVE_SYS_TIMES_H
+#include <sys/times.h>
+#endif
+static struct tms ts, te;
+#define GETTIME(t)         times(&(t))
+#define TIMEDIFF(te,ts)   ((te).tms_utime - (ts).tms_utime)
+#endif
+
+static int OpCounter[256];
+static int OpPrevCounter[256];
+static unsigned long OpTime[256];
+static int OpCurr = OP_FINISH;
+static int OpPrevTarget = OP_FAIL;
+static int MaxStackDepth = 0;
+
+#define MOP_IN(opcode) do {\
+  if (opcode == OpPrevTarget) OpPrevCounter[OpCurr]++;\
+  OpCurr = opcode;\
+  OpCounter[opcode]++;\
+  GETTIME(ts);\
+} while(0)
+
+#define MOP_OUT do {\
+  GETTIME(te);\
+  OpTime[OpCurr] += TIMEDIFF(te, ts);\
+} while(0)
+
+extern void
+onig_statistics_init(void)
+{
+  int i;
+  for (i = 0; i < 256; i++) {
+    OpCounter[i] = OpPrevCounter[i] = 0; OpTime[i] = 0;
+  }
+  MaxStackDepth = 0;
+}
+
+extern void
+onig_print_statistics(FILE* f)
+{
+  int i;
+  fprintf(f, "   count      prev        time\n");
+  for (i = 0; OnigOpInfo[i].opcode >= 0; i++) {
+    fprintf(f, "%8d: %8d: %10ld: %s\n",
+	    OpCounter[i], OpPrevCounter[i], OpTime[i], OnigOpInfo[i].name);
+  }
+  fprintf(f, "\nmax stack depth: %d\n", MaxStackDepth);
+}
+
+#define STACK_INC do {\
+  stk++;\
+  if (stk - stk_base > MaxStackDepth) \
+    MaxStackDepth = stk - stk_base;\
+} while(0)
+
+#else
+#define STACK_INC     stk++
+
+#define MOP_IN(opcode)
+#define MOP_OUT
+#endif
+
+
+/* matching region of POSIX API */
+typedef int regoff_t;
+
+typedef struct {
+  regoff_t  rm_so;
+  regoff_t  rm_eo;
+} posix_regmatch_t;
+
+/* match data(str - end) from position (sstart). */
+/* if sstart == str then set sprev to NULL. */
+static int
+match_at(regex_t* reg, const UChar* str, const UChar* end,
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+	 const UChar* right_range,
+#endif
+	 const UChar* sstart, UChar* sprev, OnigMatchArg* msa)
+{
+  static UChar FinishCode[] = { OP_FINISH };
+
+  int i, n, num_mem, best_len, pop_level;
+  LengthType tlen, tlen2;
+  MemNumType mem;
+  RelAddrType addr;
+  OnigOptionType option = reg->options;
+  OnigEncoding encode = reg->enc;
+  OnigCaseFoldType case_fold_flag = reg->case_fold_flag;
+  UChar *s, *q, *sbegin;
+  UChar *p = reg->p;
+  char *alloca_base;
+  OnigStackType *stk_alloc, *stk_base, *stk, *stk_end;
+  OnigStackType *stkp; /* used as any purpose. */
+  OnigStackIndex si;
+  OnigStackIndex *repeat_stk;
+  OnigStackIndex *mem_start_stk, *mem_end_stk;
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+  int scv;
+  unsigned char* state_check_buff = msa->state_check_buff;
+  int num_comb_exp_check = reg->num_comb_exp_check;
+#endif
+  n = reg->num_repeat + reg->num_mem * 2;
+
+  STACK_INIT(alloca_base, n, INIT_MATCH_STACK_SIZE);
+  pop_level = reg->stack_pop_level;
+  num_mem = reg->num_mem;
+  repeat_stk = (OnigStackIndex* )alloca_base;
+
+  mem_start_stk = (OnigStackIndex* )(repeat_stk + reg->num_repeat);
+  mem_end_stk   = mem_start_stk + num_mem;
+  mem_start_stk--; /* for index start from 1,
+		      mem_start_stk[1]..mem_start_stk[num_mem] */
+  mem_end_stk--;   /* for index start from 1,
+		      mem_end_stk[1]..mem_end_stk[num_mem] */
+  for (i = 1; i <= num_mem; i++) {
+    mem_start_stk[i] = mem_end_stk[i] = INVALID_STACK_INDEX;
+  }
+
+#ifdef ONIG_DEBUG_MATCH
+  fprintf(stderr, "match_at: str: %d, end: %d, start: %d, sprev: %d\n",
+	  (int )str, (int )end, (int )sstart, (int )sprev);
+  fprintf(stderr, "size: %d, start offset: %d\n",
+	  (int )(end - str), (int )(sstart - str));
+#endif
+
+  STACK_PUSH_ENSURED(STK_ALT, FinishCode);  /* bottom stack */
+  best_len = ONIG_MISMATCH;
+  s = (UChar* )sstart;
+  while (1) {
+#ifdef ONIG_DEBUG_MATCH
+    {
+      UChar *q, *bp, buf[50];
+      int len;
+      fprintf(stderr, "%4d> \"", (int )(s - str));
+      bp = buf;
+      for (i = 0, q = s; i < 7 && q < end; i++) {
+	len = enclen(encode, q);
+	while (len-- > 0) *bp++ = *q++;
+      }
+      if (q < end) { xmemcpy(bp, "...\"", 4); bp += 4; }
+      else         { xmemcpy(bp, "\"",    1); bp += 1; }
+      *bp = 0;
+      fputs((char* )buf, stderr);
+      for (i = 0; i < 20 - (bp - buf); i++) fputc(' ', stderr);
+      onig_print_compiled_byte_code(stderr, p, NULL, encode);
+      fprintf(stderr, "\n");
+    }
+#endif
+
+    sbegin = s;
+    switch (*p++) {
+    case OP_END:  MOP_IN(OP_END);
+      n = s - sstart;
+      if (n > best_len) {
+	OnigRegion* region;
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+	if (IS_FIND_LONGEST(option)) {
+	  if (n > msa->best_len) {
+	    msa->best_len = n;
+	    msa->best_s   = (UChar* )sstart;
+	  }
+	  else
+	    goto end_best_len;
+        }
+#endif
+	best_len = n;
+	region = msa->region;
+	if (region) {
+#ifdef USE_POSIX_API_REGION_OPTION
+	  if (IS_POSIX_REGION(msa->options)) {
+	    posix_regmatch_t* rmt = (posix_regmatch_t* )region;
+
+	    rmt[0].rm_so = sstart - str;
+	    rmt[0].rm_eo = s      - str;
+	    for (i = 1; i <= num_mem; i++) {
+	      if (mem_end_stk[i] != INVALID_STACK_INDEX) {
+		if (BIT_STATUS_AT(reg->bt_mem_start, i))
+		  rmt[i].rm_so = STACK_AT(mem_start_stk[i])->u.mem.pstr - str;
+		else
+		  rmt[i].rm_so = (UChar* )((void* )(mem_start_stk[i])) - str;
+
+		rmt[i].rm_eo = (BIT_STATUS_AT(reg->bt_mem_end, i)
+				? STACK_AT(mem_end_stk[i])->u.mem.pstr
+				: (UChar* )((void* )mem_end_stk[i])) - str;
+	      }
+	      else {
+		rmt[i].rm_so = rmt[i].rm_eo = ONIG_REGION_NOTPOS;
+	      }
+	    }
+	  }
+	  else {
+#endif /* USE_POSIX_API_REGION_OPTION */
+	    region->beg[0] = sstart - str;
+	    region->end[0] = s      - str;
+	    for (i = 1; i <= num_mem; i++) {
+	      if (mem_end_stk[i] != INVALID_STACK_INDEX) {
+		if (BIT_STATUS_AT(reg->bt_mem_start, i))
+		  region->beg[i] = STACK_AT(mem_start_stk[i])->u.mem.pstr - str;
+		else
+		  region->beg[i] = (UChar* )((void* )mem_start_stk[i]) - str;
+
+		region->end[i] = (BIT_STATUS_AT(reg->bt_mem_end, i)
+				  ? STACK_AT(mem_end_stk[i])->u.mem.pstr
+				  : (UChar* )((void* )mem_end_stk[i])) - str;
+	      }
+	      else {
+		region->beg[i] = region->end[i] = ONIG_REGION_NOTPOS;
+	      }
+	    }
+
+#ifdef USE_CAPTURE_HISTORY
+	    if (reg->capture_history != 0) {
+              int r;
+              OnigCaptureTreeNode* node;
+
+              if (IS_NULL(region->history_root)) {
+                region->history_root = node = history_node_new();
+                CHECK_NULL_RETURN_MEMERR(node);
+              }
+              else {
+                node = region->history_root;
+                history_tree_clear(node);
+              }
+
+              node->group = 0;
+              node->beg   = sstart - str;
+              node->end   = s      - str;
+
+              stkp = stk_base;
+              r = make_capture_history_tree(region->history_root, &stkp,
+                                            stk, (UChar* )str, reg);
+              if (r < 0) {
+                best_len = r; /* error code */
+                goto finish;
+              }
+	    }
+#endif /* USE_CAPTURE_HISTORY */
+#ifdef USE_POSIX_API_REGION_OPTION
+	  } /* else IS_POSIX_REGION() */
+#endif
+	} /* if (region) */
+      } /* n > best_len */
+
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+    end_best_len:
+#endif
+      MOP_OUT;
+
+      if (IS_FIND_CONDITION(option)) {
+	if (IS_FIND_NOT_EMPTY(option) && s == sstart) {
+	  best_len = ONIG_MISMATCH;
+	  goto fail; /* for retry */
+	}
+	if (IS_FIND_LONGEST(option) && DATA_ENSURE_CHECK1) {
+	  goto fail; /* for retry */
+	}
+      }
+
+      /* default behavior: return first-matching result. */
+      goto finish;
+      break;
+
+    case OP_EXACT1:  MOP_IN(OP_EXACT1);
+#if 0
+      DATA_ENSURE(1);
+      if (*p != *s) goto fail;
+      p++; s++;
+#endif
+      if (*p != *s++) goto fail;
+      DATA_ENSURE(0);
+      p++;
+      MOP_OUT;
+      break;
+
+    case OP_EXACT1_IC:  MOP_IN(OP_EXACT1_IC);
+      {
+	int len;
+	UChar *q, lowbuf[ONIGENC_MBC_CASE_FOLD_MAXLEN];
+
+	DATA_ENSURE(1);
+	len = ONIGENC_MBC_CASE_FOLD(encode,
+		    /* DISABLE_CASE_FOLD_MULTI_CHAR(case_fold_flag), */
+		    case_fold_flag,
+		    &s, end, lowbuf);
+	DATA_ENSURE(0);
+	q = lowbuf;
+	while (len-- > 0) {
+	  if (*p != *q) {
+            goto fail;
+          }
+	  p++; q++;
+	}
+      }
+      MOP_OUT;
+      break;
+
+    case OP_EXACT2:  MOP_IN(OP_EXACT2);
+      DATA_ENSURE(2);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      sprev = s;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACT3:  MOP_IN(OP_EXACT3);
+      DATA_ENSURE(3);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      sprev = s;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACT4:  MOP_IN(OP_EXACT4);
+      DATA_ENSURE(4);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      sprev = s;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACT5:  MOP_IN(OP_EXACT5);
+      DATA_ENSURE(5);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      sprev = s;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTN:  MOP_IN(OP_EXACTN);
+      GET_LENGTH_INC(tlen, p);
+      DATA_ENSURE(tlen);
+      while (tlen-- > 0) {
+	if (*p++ != *s++) goto fail;
+      }
+      sprev = s - 1;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTN_IC:  MOP_IN(OP_EXACTN_IC);
+      {
+	int len;
+	UChar *q, *endp, lowbuf[ONIGENC_MBC_CASE_FOLD_MAXLEN];
+
+	GET_LENGTH_INC(tlen, p);
+	endp = p + tlen;
+
+	while (p < endp) {
+	  sprev = s;
+	  DATA_ENSURE(1);
+	  len = ONIGENC_MBC_CASE_FOLD(encode,
+		      /* DISABLE_CASE_FOLD_MULTI_CHAR(case_fold_flag), */
+		      case_fold_flag,
+		      &s, end, lowbuf);
+	  DATA_ENSURE(0);
+	  q = lowbuf;
+	  while (len-- > 0) {
+	    if (*p != *q) goto fail;
+	    p++; q++;
+	  }
+	}
+      }
+
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTMB2N1:  MOP_IN(OP_EXACTMB2N1);
+      DATA_ENSURE(2);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      MOP_OUT;
+      break;
+
+    case OP_EXACTMB2N2:  MOP_IN(OP_EXACTMB2N2);
+      DATA_ENSURE(4);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      sprev = s;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTMB2N3:  MOP_IN(OP_EXACTMB2N3);
+      DATA_ENSURE(6);
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      sprev = s;
+      if (*p != *s) goto fail;
+      p++; s++;
+      if (*p != *s) goto fail;
+      p++; s++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTMB2N:  MOP_IN(OP_EXACTMB2N);
+      GET_LENGTH_INC(tlen, p);
+      DATA_ENSURE(tlen * 2);
+      while (tlen-- > 0) {
+	if (*p != *s) goto fail;
+	p++; s++;
+	if (*p != *s) goto fail;
+	p++; s++;
+      }
+      sprev = s - 2;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTMB3N:  MOP_IN(OP_EXACTMB3N);
+      GET_LENGTH_INC(tlen, p);
+      DATA_ENSURE(tlen * 3);
+      while (tlen-- > 0) {
+	if (*p != *s) goto fail;
+	p++; s++;
+	if (*p != *s) goto fail;
+	p++; s++;
+	if (*p != *s) goto fail;
+	p++; s++;
+      }
+      sprev = s - 3;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_EXACTMBN:  MOP_IN(OP_EXACTMBN);
+      GET_LENGTH_INC(tlen,  p);  /* mb-len */
+      GET_LENGTH_INC(tlen2, p);  /* string len */
+      tlen2 *= tlen;
+      DATA_ENSURE(tlen2);
+      while (tlen2-- > 0) {
+	if (*p != *s) goto fail;
+	p++; s++;
+      }
+      sprev = s - tlen;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_CCLASS:  MOP_IN(OP_CCLASS);
+      DATA_ENSURE(1);
+      if (BITSET_AT(((BitSetRef )p), *s) == 0) goto fail;
+      p += SIZE_BITSET;
+      s += enclen(encode, s);   /* OP_CCLASS can match mb-code. \D, \S */
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_MB:  MOP_IN(OP_CCLASS_MB);
+      if (! ONIGENC_IS_MBC_HEAD(encode, s)) goto fail;
+
+    cclass_mb:
+      GET_LENGTH_INC(tlen, p);
+      {
+	OnigCodePoint code;
+	UChar *ss;
+	int mb_len;
+
+	DATA_ENSURE(1);
+	mb_len = enclen(encode, s);
+	DATA_ENSURE(mb_len);
+	ss = s;
+	s += mb_len;
+	code = ONIGENC_MBC_TO_CODE(encode, ss, s);
+
+#ifdef PLATFORM_UNALIGNED_WORD_ACCESS
+	if (! onig_is_in_code_range(p, code)) goto fail;
+#else
+	q = p;
+	ALIGNMENT_RIGHT(q);
+	if (! onig_is_in_code_range(q, code)) goto fail;
+#endif
+      }
+      p += tlen;
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_MIX:  MOP_IN(OP_CCLASS_MIX);
+      DATA_ENSURE(1);
+      if (ONIGENC_IS_MBC_HEAD(encode, s)) {
+	p += SIZE_BITSET;
+	goto cclass_mb;
+      }
+      else {
+	if (BITSET_AT(((BitSetRef )p), *s) == 0)
+	  goto fail;
+
+	p += SIZE_BITSET;
+	GET_LENGTH_INC(tlen, p);
+	p += tlen;
+	s++;
+      }
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_NOT:  MOP_IN(OP_CCLASS_NOT);
+      DATA_ENSURE(1);
+      if (BITSET_AT(((BitSetRef )p), *s) != 0) goto fail;
+      p += SIZE_BITSET;
+      s += enclen(encode, s);
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_MB_NOT:  MOP_IN(OP_CCLASS_MB_NOT);
+      DATA_ENSURE(1);
+      if (! ONIGENC_IS_MBC_HEAD(encode, s)) {
+	s++;
+	GET_LENGTH_INC(tlen, p);
+	p += tlen;
+	goto cc_mb_not_success;
+      }
+
+    cclass_mb_not:
+      GET_LENGTH_INC(tlen, p);
+      {
+	OnigCodePoint code;
+	UChar *ss;
+	int mb_len = enclen(encode, s);
+
+	if (! DATA_ENSURE_CHECK(mb_len)) {
+          DATA_ENSURE(1);
+	  s = (UChar* )end;
+	  p += tlen;
+	  goto cc_mb_not_success;
+	}
+
+	ss = s;
+	s += mb_len;
+	code = ONIGENC_MBC_TO_CODE(encode, ss, s);
+
+#ifdef PLATFORM_UNALIGNED_WORD_ACCESS
+	if (onig_is_in_code_range(p, code)) goto fail;
+#else
+	q = p;
+	ALIGNMENT_RIGHT(q);
+	if (onig_is_in_code_range(q, code)) goto fail;
+#endif
+      }
+      p += tlen;
+
+    cc_mb_not_success:
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_MIX_NOT:  MOP_IN(OP_CCLASS_MIX_NOT);
+      DATA_ENSURE(1);
+      if (ONIGENC_IS_MBC_HEAD(encode, s)) {
+	p += SIZE_BITSET;
+	goto cclass_mb_not;
+      }
+      else {
+	if (BITSET_AT(((BitSetRef )p), *s) != 0)
+	  goto fail;
+
+	p += SIZE_BITSET;
+	GET_LENGTH_INC(tlen, p);
+	p += tlen;
+	s++;
+      }
+      MOP_OUT;
+      break;
+
+    case OP_CCLASS_NODE:  MOP_IN(OP_CCLASS_NODE);
+      {
+	OnigCodePoint code;
+        void *node;
+        int mb_len;
+        UChar *ss;
+
+        DATA_ENSURE(1);
+        GET_POINTER_INC(node, p);
+	mb_len = enclen(encode, s);
+	ss = s;
+	s += mb_len;
+	DATA_ENSURE(0);
+	code = ONIGENC_MBC_TO_CODE(encode, ss, s);
+	if (onig_is_code_in_cc_len(mb_len, code, node) == 0) goto fail;
+      }
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR:  MOP_IN(OP_ANYCHAR);
+      DATA_ENSURE(1);
+      n = enclen(encode, s);
+      DATA_ENSURE(n);
+      if (ONIGENC_IS_MBC_NEWLINE(encode, s, end)) goto fail;
+      s += n;
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR_ML:  MOP_IN(OP_ANYCHAR_ML);
+      DATA_ENSURE(1);
+      n = enclen(encode, s);
+      DATA_ENSURE(n);
+      s += n;
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR_STAR:  MOP_IN(OP_ANYCHAR_STAR);
+      while (DATA_ENSURE_CHECK1) {
+	STACK_PUSH_ALT(p, s, sprev);
+	n = enclen(encode, s);
+        DATA_ENSURE(n);
+        if (ONIGENC_IS_MBC_NEWLINE(encode, s, end))  goto fail;
+        sprev = s;
+        s += n;
+      }
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR_ML_STAR:  MOP_IN(OP_ANYCHAR_ML_STAR);
+      while (DATA_ENSURE_CHECK1) {
+	STACK_PUSH_ALT(p, s, sprev);
+	n = enclen(encode, s);
+	if (n > 1) {
+	  DATA_ENSURE(n);
+	  sprev = s;
+	  s += n;
+	}
+	else {
+	  sprev = s;
+	  s++;
+	}
+      }
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR_STAR_PEEK_NEXT:  MOP_IN(OP_ANYCHAR_STAR_PEEK_NEXT);
+      while (DATA_ENSURE_CHECK1) {
+	if (*p == *s) {
+	  STACK_PUSH_ALT(p + 1, s, sprev);
+	}
+	n = enclen(encode, s);
+        DATA_ENSURE(n);
+        if (ONIGENC_IS_MBC_NEWLINE(encode, s, end))  goto fail;
+        sprev = s;
+        s += n;
+      }
+      p++;
+      MOP_OUT;
+      break;
+
+    case OP_ANYCHAR_ML_STAR_PEEK_NEXT:MOP_IN(OP_ANYCHAR_ML_STAR_PEEK_NEXT);
+      while (DATA_ENSURE_CHECK1) {
+	if (*p == *s) {
+	  STACK_PUSH_ALT(p + 1, s, sprev);
+	}
+	n = enclen(encode, s);
+	if (n > 1) {
+	  DATA_ENSURE(n);
+	  sprev = s;
+	  s += n;
+	}
+	else {
+	  sprev = s;
+	  s++;
+	}
+      }
+      p++;
+      MOP_OUT;
+      break;
+
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+    case OP_STATE_CHECK_ANYCHAR_STAR:  MOP_IN(OP_STATE_CHECK_ANYCHAR_STAR);
+      GET_STATE_CHECK_NUM_INC(mem, p);
+      while (DATA_ENSURE_CHECK1) {
+	STATE_CHECK_VAL(scv, mem);
+	if (scv) goto fail;
+
+	STACK_PUSH_ALT_WITH_STATE_CHECK(p, s, sprev, mem);
+	n = enclen(encode, s);
+        DATA_ENSURE(n);
+        if (ONIGENC_IS_MBC_NEWLINE(encode, s, end))  goto fail;
+        sprev = s;
+        s += n;
+      }
+      MOP_OUT;
+      break;
+
+    case OP_STATE_CHECK_ANYCHAR_ML_STAR:
+      MOP_IN(OP_STATE_CHECK_ANYCHAR_ML_STAR);
+
+      GET_STATE_CHECK_NUM_INC(mem, p);
+      while (DATA_ENSURE_CHECK1) {
+	STATE_CHECK_VAL(scv, mem);
+	if (scv) goto fail;
+
+	STACK_PUSH_ALT_WITH_STATE_CHECK(p, s, sprev, mem);
+	n = enclen(encode, s);
+	if (n > 1) {
+	  DATA_ENSURE(n);
+	  sprev = s;
+	  s += n;
+	}
+	else {
+	  sprev = s;
+	  s++;
+	}
+      }
+      MOP_OUT;
+      break;
+#endif /* USE_COMBINATION_EXPLOSION_CHECK */
+
+    case OP_WORD:  MOP_IN(OP_WORD);
+      DATA_ENSURE(1);
+      if (! ONIGENC_IS_MBC_WORD(encode, s, end))
+	goto fail;
+
+      s += enclen(encode, s);
+      MOP_OUT;
+      break;
+
+    case OP_NOT_WORD:  MOP_IN(OP_NOT_WORD);
+      DATA_ENSURE(1);
+      if (ONIGENC_IS_MBC_WORD(encode, s, end))
+	goto fail;
+
+      s += enclen(encode, s);
+      MOP_OUT;
+      break;
+
+    case OP_WORD_BOUND:  MOP_IN(OP_WORD_BOUND);
+      if (ON_STR_BEGIN(s)) {
+	DATA_ENSURE(1);
+	if (! ONIGENC_IS_MBC_WORD(encode, s, end))
+	  goto fail;
+      }
+      else if (ON_STR_END(s)) {
+	if (! ONIGENC_IS_MBC_WORD(encode, sprev, end))
+	  goto fail;
+      }
+      else {
+	if (ONIGENC_IS_MBC_WORD(encode, s, end)
+	    == ONIGENC_IS_MBC_WORD(encode, sprev, end))
+	  goto fail;
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_NOT_WORD_BOUND:  MOP_IN(OP_NOT_WORD_BOUND);
+      if (ON_STR_BEGIN(s)) {
+	if (DATA_ENSURE_CHECK1 && ONIGENC_IS_MBC_WORD(encode, s, end))
+	  goto fail;
+      }
+      else if (ON_STR_END(s)) {
+	if (ONIGENC_IS_MBC_WORD(encode, sprev, end))
+	  goto fail;
+      }
+      else {
+	if (ONIGENC_IS_MBC_WORD(encode, s, end)
+	    != ONIGENC_IS_MBC_WORD(encode, sprev, end))
+	  goto fail;
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+#ifdef USE_WORD_BEGIN_END
+    case OP_WORD_BEGIN:  MOP_IN(OP_WORD_BEGIN);
+      if (DATA_ENSURE_CHECK1 && ONIGENC_IS_MBC_WORD(encode, s, end)) {
+	if (ON_STR_BEGIN(s) || !ONIGENC_IS_MBC_WORD(encode, sprev, end)) {
+	  MOP_OUT;
+	  continue;
+	}
+      }
+      goto fail;
+      break;
+
+    case OP_WORD_END:  MOP_IN(OP_WORD_END);
+      if (!ON_STR_BEGIN(s) && ONIGENC_IS_MBC_WORD(encode, sprev, end)) {
+	if (ON_STR_END(s) || !ONIGENC_IS_MBC_WORD(encode, s, end)) {
+	  MOP_OUT;
+	  continue;
+	}
+      }
+      goto fail;
+      break;
+#endif
+
+    case OP_BEGIN_BUF:  MOP_IN(OP_BEGIN_BUF);
+      if (! ON_STR_BEGIN(s)) goto fail;
+
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_END_BUF:  MOP_IN(OP_END_BUF);
+      if (! ON_STR_END(s)) goto fail;
+
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_BEGIN_LINE:  MOP_IN(OP_BEGIN_LINE);
+      if (ON_STR_BEGIN(s)) {
+	if (IS_NOTBOL(msa->options)) goto fail;
+	MOP_OUT;
+	continue;
+      }
+      else if (ONIGENC_IS_MBC_NEWLINE(encode, sprev, end) && !ON_STR_END(s)) {
+	MOP_OUT;
+	continue;
+      }
+      goto fail;
+      break;
+
+    case OP_END_LINE:  MOP_IN(OP_END_LINE);
+      if (ON_STR_END(s)) {
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	if (IS_EMPTY_STR || !ONIGENC_IS_MBC_NEWLINE(encode, sprev, end)) {
+#endif
+	  if (IS_NOTEOL(msa->options)) goto fail;
+	  MOP_OUT;
+	  continue;
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	}
+#endif
+      }
+      else if (ONIGENC_IS_MBC_NEWLINE(encode, s, end)) {
+	MOP_OUT;
+	continue;
+      }
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+      else if (ONIGENC_IS_MBC_CRNL(encode, s, end)) {
+	MOP_OUT;
+	continue;
+      }
+#endif
+      goto fail;
+      break;
+
+    case OP_SEMI_END_BUF:  MOP_IN(OP_SEMI_END_BUF);
+      if (ON_STR_END(s)) {
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	if (IS_EMPTY_STR || !ONIGENC_IS_MBC_NEWLINE(encode, sprev, end)) {
+#endif
+	  if (IS_NOTEOL(msa->options)) goto fail;
+	  MOP_OUT;
+	  continue;
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	}
+#endif
+      }
+      else if (ONIGENC_IS_MBC_NEWLINE(encode, s, end) &&
+	       ON_STR_END(s + enclen(encode, s))) {
+	MOP_OUT;
+	continue;
+      }
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+      else if (ONIGENC_IS_MBC_CRNL(encode, s, end)) {
+        UChar* ss = s + enclen(encode, s);
+	ss += enclen(encode, ss);
+        if (ON_STR_END(ss)) {
+          MOP_OUT;
+          continue;
+        }
+      }
+#endif
+      goto fail;
+      break;
+
+    case OP_BEGIN_POSITION:  MOP_IN(OP_BEGIN_POSITION);
+      if (s != msa->start)
+	goto fail;
+
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_MEMORY_START_PUSH:  MOP_IN(OP_MEMORY_START_PUSH);
+      GET_MEMNUM_INC(mem, p);
+      STACK_PUSH_MEM_START(mem, s);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_MEMORY_START:  MOP_IN(OP_MEMORY_START);
+      GET_MEMNUM_INC(mem, p);
+      mem_start_stk[mem] = (OnigStackIndex )((void* )s);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_MEMORY_END_PUSH:  MOP_IN(OP_MEMORY_END_PUSH);
+      GET_MEMNUM_INC(mem, p);
+      STACK_PUSH_MEM_END(mem, s);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_MEMORY_END:  MOP_IN(OP_MEMORY_END);
+      GET_MEMNUM_INC(mem, p);
+      mem_end_stk[mem] = (OnigStackIndex )((void* )s);
+      MOP_OUT;
+      continue;
+      break;
+
+#ifdef USE_SUBEXP_CALL
+    case OP_MEMORY_END_PUSH_REC:  MOP_IN(OP_MEMORY_END_PUSH_REC);
+      GET_MEMNUM_INC(mem, p);
+      STACK_GET_MEM_START(mem, stkp); /* should be before push mem-end. */
+      STACK_PUSH_MEM_END(mem, s);
+      mem_start_stk[mem] = GET_STACK_INDEX(stkp);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_MEMORY_END_REC:  MOP_IN(OP_MEMORY_END_REC);
+      GET_MEMNUM_INC(mem, p);
+      mem_end_stk[mem] = (OnigStackIndex )((void* )s);
+      STACK_GET_MEM_START(mem, stkp);
+
+      if (BIT_STATUS_AT(reg->bt_mem_start, mem))
+	mem_start_stk[mem] = GET_STACK_INDEX(stkp);
+      else
+	mem_start_stk[mem] = (OnigStackIndex )((void* )stkp->u.mem.pstr);
+
+      STACK_PUSH_MEM_END_MARK(mem);
+      MOP_OUT;
+      continue;
+      break;
+#endif
+
+    case OP_BACKREF1:  MOP_IN(OP_BACKREF1);
+      mem = 1;
+      goto backref;
+      break;
+
+    case OP_BACKREF2:  MOP_IN(OP_BACKREF2);
+      mem = 2;
+      goto backref;
+      break;
+
+    case OP_BACKREFN:  MOP_IN(OP_BACKREFN);
+      GET_MEMNUM_INC(mem, p);
+    backref:
+      {
+	int len;
+	UChar *pstart, *pend;
+
+	/* if you want to remove following line, 
+	   you should check in parse and compile time. */
+	if (mem > num_mem) goto fail;
+	if (mem_end_stk[mem]   == INVALID_STACK_INDEX) goto fail;
+	if (mem_start_stk[mem] == INVALID_STACK_INDEX) goto fail;
+
+	if (BIT_STATUS_AT(reg->bt_mem_start, mem))
+	  pstart = STACK_AT(mem_start_stk[mem])->u.mem.pstr;
+	else
+	  pstart = (UChar* )((void* )mem_start_stk[mem]);
+
+	pend = (BIT_STATUS_AT(reg->bt_mem_end, mem)
+		? STACK_AT(mem_end_stk[mem])->u.mem.pstr
+		: (UChar* )((void* )mem_end_stk[mem]));
+	n = pend - pstart;
+	DATA_ENSURE(n);
+	sprev = s;
+	STRING_CMP(pstart, s, n);
+	while (sprev + (len = enclen(encode, sprev)) < s)
+	  sprev += len;
+
+	MOP_OUT;
+	continue;
+      }
+      break;
+
+    case OP_BACKREFN_IC:  MOP_IN(OP_BACKREFN_IC);
+      GET_MEMNUM_INC(mem, p);
+      {
+	int len;
+	UChar *pstart, *pend;
+
+	/* if you want to remove following line, 
+	   you should check in parse and compile time. */
+	if (mem > num_mem) goto fail;
+	if (mem_end_stk[mem]   == INVALID_STACK_INDEX) goto fail;
+	if (mem_start_stk[mem] == INVALID_STACK_INDEX) goto fail;
+
+	if (BIT_STATUS_AT(reg->bt_mem_start, mem))
+	  pstart = STACK_AT(mem_start_stk[mem])->u.mem.pstr;
+	else
+	  pstart = (UChar* )((void* )mem_start_stk[mem]);
+
+	pend = (BIT_STATUS_AT(reg->bt_mem_end, mem)
+		? STACK_AT(mem_end_stk[mem])->u.mem.pstr
+		: (UChar* )((void* )mem_end_stk[mem]));
+	n = pend - pstart;
+	DATA_ENSURE(n);
+	sprev = s;
+	STRING_CMP_IC(case_fold_flag, pstart, &s, n);
+	while (sprev + (len = enclen(encode, sprev)) < s)
+	  sprev += len;
+
+	MOP_OUT;
+	continue;
+      }
+      break;
+
+    case OP_BACKREF_MULTI:  MOP_IN(OP_BACKREF_MULTI);
+      {
+	int len, is_fail;
+	UChar *pstart, *pend, *swork;
+
+	GET_LENGTH_INC(tlen, p);
+	for (i = 0; i < tlen; i++) {
+	  GET_MEMNUM_INC(mem, p);
+
+	  if (mem_end_stk[mem]   == INVALID_STACK_INDEX) continue;
+	  if (mem_start_stk[mem] == INVALID_STACK_INDEX) continue;
+
+	  if (BIT_STATUS_AT(reg->bt_mem_start, mem))
+	    pstart = STACK_AT(mem_start_stk[mem])->u.mem.pstr;
+	  else
+	    pstart = (UChar* )((void* )mem_start_stk[mem]);
+
+	  pend = (BIT_STATUS_AT(reg->bt_mem_end, mem)
+		  ? STACK_AT(mem_end_stk[mem])->u.mem.pstr
+		  : (UChar* )((void* )mem_end_stk[mem]));
+	  n = pend - pstart;
+	  DATA_ENSURE(n);
+	  sprev = s;
+	  swork = s;
+	  STRING_CMP_VALUE(pstart, swork, n, is_fail);
+	  if (is_fail) continue;
+	  s = swork;
+	  while (sprev + (len = enclen(encode, sprev)) < s)
+	    sprev += len;
+
+	  p += (SIZE_MEMNUM * (tlen - i - 1));
+	  break; /* success */
+	}
+	if (i == tlen) goto fail;
+	MOP_OUT;
+	continue;
+      }
+      break;
+
+    case OP_BACKREF_MULTI_IC:  MOP_IN(OP_BACKREF_MULTI_IC);
+      {
+	int len, is_fail;
+	UChar *pstart, *pend, *swork;
+
+	GET_LENGTH_INC(tlen, p);
+	for (i = 0; i < tlen; i++) {
+	  GET_MEMNUM_INC(mem, p);
+
+	  if (mem_end_stk[mem]   == INVALID_STACK_INDEX) continue;
+	  if (mem_start_stk[mem] == INVALID_STACK_INDEX) continue;
+
+	  if (BIT_STATUS_AT(reg->bt_mem_start, mem))
+	    pstart = STACK_AT(mem_start_stk[mem])->u.mem.pstr;
+	  else
+	    pstart = (UChar* )((void* )mem_start_stk[mem]);
+
+	  pend = (BIT_STATUS_AT(reg->bt_mem_end, mem)
+		  ? STACK_AT(mem_end_stk[mem])->u.mem.pstr
+		  : (UChar* )((void* )mem_end_stk[mem]));
+	  n = pend - pstart;
+	  DATA_ENSURE(n);
+	  sprev = s;
+	  swork = s;
+	  STRING_CMP_VALUE_IC(case_fold_flag, pstart, &swork, n, is_fail);
+	  if (is_fail) continue;
+	  s = swork;
+	  while (sprev + (len = enclen(encode, sprev)) < s)
+	    sprev += len;
+
+	  p += (SIZE_MEMNUM * (tlen - i - 1));
+	  break; /* success */
+	}
+	if (i == tlen) goto fail;
+	MOP_OUT;
+	continue;
+      }
+      break;
+
+#ifdef USE_BACKREF_WITH_LEVEL
+    case OP_BACKREF_WITH_LEVEL:
+      {
+	int len;
+	OnigOptionType ic;
+	LengthType level;
+
+	GET_OPTION_INC(ic,    p);
+	GET_LENGTH_INC(level, p);
+	GET_LENGTH_INC(tlen,  p);
+
+	sprev = s;
+	if (backref_match_at_nested_level(reg, stk, stk_base, ic
+		  , case_fold_flag, (int )level, (int )tlen, p, &s, end)) {
+	  while (sprev + (len = enclen(encode, sprev)) < s)
+	    sprev += len;
+
+	  p += (SIZE_MEMNUM * tlen);
+	}
+	else
+	  goto fail;
+
+	MOP_OUT;
+	continue;
+      }
+      
+      break;
+#endif
+
+#if 0   /* no need: IS_DYNAMIC_OPTION() == 0 */
+    case OP_SET_OPTION_PUSH:  MOP_IN(OP_SET_OPTION_PUSH);
+      GET_OPTION_INC(option, p);
+      STACK_PUSH_ALT(p, s, sprev);
+      p += SIZE_OP_SET_OPTION + SIZE_OP_FAIL;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_SET_OPTION:  MOP_IN(OP_SET_OPTION);
+      GET_OPTION_INC(option, p);
+      MOP_OUT;
+      continue;
+      break;
+#endif
+
+    case OP_NULL_CHECK_START:  MOP_IN(OP_NULL_CHECK_START);
+      GET_MEMNUM_INC(mem, p);    /* mem: null check id */
+      STACK_PUSH_NULL_CHECK_START(mem, s);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_NULL_CHECK_END:  MOP_IN(OP_NULL_CHECK_END);
+      {
+	int isnull;
+
+	GET_MEMNUM_INC(mem, p); /* mem: null check id */
+	STACK_NULL_CHECK(isnull, mem, s);
+	if (isnull) {
+#ifdef ONIG_DEBUG_MATCH
+	  fprintf(stderr, "NULL_CHECK_END: skip  id:%d, s:%d\n",
+		  (int )mem, (int )s);
+#endif
+	null_check_found:
+	  /* empty loop founded, skip next instruction */
+	  switch (*p++) {
+	  case OP_JUMP:
+	  case OP_PUSH:
+	    p += SIZE_RELADDR;
+	    break;
+	  case OP_REPEAT_INC:
+	  case OP_REPEAT_INC_NG:
+	  case OP_REPEAT_INC_SG:
+	  case OP_REPEAT_INC_NG_SG:
+	    p += SIZE_MEMNUM;
+	    break;
+	  default:
+	    goto unexpected_bytecode_error;
+	    break;
+	  }
+	}
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+#ifdef USE_MONOMANIAC_CHECK_CAPTURES_IN_ENDLESS_REPEAT
+    case OP_NULL_CHECK_END_MEMST:  MOP_IN(OP_NULL_CHECK_END_MEMST);
+      {
+	int isnull;
+
+	GET_MEMNUM_INC(mem, p); /* mem: null check id */
+	STACK_NULL_CHECK_MEMST(isnull, mem, s, reg);
+	if (isnull) {
+#ifdef ONIG_DEBUG_MATCH
+	  fprintf(stderr, "NULL_CHECK_END_MEMST: skip  id:%d, s:%d\n",
+		  (int )mem, (int )s);
+#endif
+	  if (isnull == -1) goto fail;
+	  goto 	null_check_found;
+	}
+      }
+      MOP_OUT;
+      continue;
+      break;
+#endif
+
+#ifdef USE_SUBEXP_CALL
+    case OP_NULL_CHECK_END_MEMST_PUSH:
+      MOP_IN(OP_NULL_CHECK_END_MEMST_PUSH);
+      {
+	int isnull;
+
+	GET_MEMNUM_INC(mem, p); /* mem: null check id */
+#ifdef USE_MONOMANIAC_CHECK_CAPTURES_IN_ENDLESS_REPEAT
+	STACK_NULL_CHECK_MEMST_REC(isnull, mem, s, reg);
+#else
+	STACK_NULL_CHECK_REC(isnull, mem, s);
+#endif
+	if (isnull) {
+#ifdef ONIG_DEBUG_MATCH
+	  fprintf(stderr, "NULL_CHECK_END_MEMST_PUSH: skip  id:%d, s:%d\n",
+		  (int )mem, (int )s);
+#endif
+	  if (isnull == -1) goto fail;
+	  goto 	null_check_found;
+	}
+	else {
+	  STACK_PUSH_NULL_CHECK_END(mem);
+	}
+      }
+      MOP_OUT;
+      continue;
+      break;
+#endif
+
+    case OP_JUMP:  MOP_IN(OP_JUMP);
+      GET_RELADDR_INC(addr, p);
+      p += addr;
+      MOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH_AT;
+      continue;
+      break;
+
+    case OP_PUSH:  MOP_IN(OP_PUSH);
+      GET_RELADDR_INC(addr, p);
+      STACK_PUSH_ALT(p + addr, s, sprev);
+      MOP_OUT;
+      continue;
+      break;
+
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+    case OP_STATE_CHECK_PUSH:  MOP_IN(OP_STATE_CHECK_PUSH);
+      GET_STATE_CHECK_NUM_INC(mem, p);
+      STATE_CHECK_VAL(scv, mem);
+      if (scv) goto fail;
+
+      GET_RELADDR_INC(addr, p);
+      STACK_PUSH_ALT_WITH_STATE_CHECK(p + addr, s, sprev, mem);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_STATE_CHECK_PUSH_OR_JUMP:  MOP_IN(OP_STATE_CHECK_PUSH_OR_JUMP);
+      GET_STATE_CHECK_NUM_INC(mem, p);
+      GET_RELADDR_INC(addr, p);
+      STATE_CHECK_VAL(scv, mem);
+      if (scv) {
+	p += addr;
+      }
+      else {
+	STACK_PUSH_ALT_WITH_STATE_CHECK(p + addr, s, sprev, mem);
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_STATE_CHECK:  MOP_IN(OP_STATE_CHECK);
+      GET_STATE_CHECK_NUM_INC(mem, p);
+      STATE_CHECK_VAL(scv, mem);
+      if (scv) goto fail;
+
+      STACK_PUSH_STATE_CHECK(s, mem);
+      MOP_OUT;
+      continue;
+      break;
+#endif /* USE_COMBINATION_EXPLOSION_CHECK */
+
+    case OP_POP:  MOP_IN(OP_POP);
+      STACK_POP_ONE;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_PUSH_OR_JUMP_EXACT1:  MOP_IN(OP_PUSH_OR_JUMP_EXACT1);
+      GET_RELADDR_INC(addr, p);
+      if (*p == *s && DATA_ENSURE_CHECK1) {
+	p++;
+	STACK_PUSH_ALT(p + addr, s, sprev);
+	MOP_OUT;
+	continue;
+      }
+      p += (addr + 1);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_PUSH_IF_PEEK_NEXT:  MOP_IN(OP_PUSH_IF_PEEK_NEXT);
+      GET_RELADDR_INC(addr, p);
+      if (*p == *s) {
+	p++;
+	STACK_PUSH_ALT(p + addr, s, sprev);
+	MOP_OUT;
+	continue;
+      }
+      p++;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_REPEAT:  MOP_IN(OP_REPEAT);
+      {
+	GET_MEMNUM_INC(mem, p);    /* mem: OP_REPEAT ID */
+	GET_RELADDR_INC(addr, p);
+
+	STACK_ENSURE(1);
+	repeat_stk[mem] = GET_STACK_INDEX(stk);
+	STACK_PUSH_REPEAT(mem, p);
+
+	if (reg->repeat_range[mem].lower == 0) {
+	  STACK_PUSH_ALT(p + addr, s, sprev);
+	}
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_REPEAT_NG:  MOP_IN(OP_REPEAT_NG);
+      {
+	GET_MEMNUM_INC(mem, p);    /* mem: OP_REPEAT ID */
+	GET_RELADDR_INC(addr, p);
+
+	STACK_ENSURE(1);
+	repeat_stk[mem] = GET_STACK_INDEX(stk);
+	STACK_PUSH_REPEAT(mem, p);
+
+	if (reg->repeat_range[mem].lower == 0) {
+	  STACK_PUSH_ALT(p, s, sprev);
+	  p += addr;
+	}
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_REPEAT_INC:  MOP_IN(OP_REPEAT_INC);
+      GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
+      si = repeat_stk[mem];
+      stkp = STACK_AT(si);
+
+    repeat_inc:
+      stkp->u.repeat.count++;
+      if (stkp->u.repeat.count >= reg->repeat_range[mem].upper) {
+        /* end of repeat. Nothing to do. */
+      }
+      else if (stkp->u.repeat.count >= reg->repeat_range[mem].lower) {
+        STACK_PUSH_ALT(p, s, sprev);
+        p = STACK_AT(si)->u.repeat.pcode; /* Don't use stkp after PUSH. */
+      }
+      else {
+        p = stkp->u.repeat.pcode;
+      }
+      STACK_PUSH_REPEAT_INC(si);
+      MOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH_AT;
+      continue;
+      break;
+
+    case OP_REPEAT_INC_SG:  MOP_IN(OP_REPEAT_INC_SG);
+      GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
+      STACK_GET_REPEAT(mem, stkp);
+      si = GET_STACK_INDEX(stkp);
+      goto repeat_inc;
+      break;
+
+    case OP_REPEAT_INC_NG:  MOP_IN(OP_REPEAT_INC_NG);
+      GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
+      si = repeat_stk[mem];
+      stkp = STACK_AT(si);
+
+    repeat_inc_ng:
+      stkp->u.repeat.count++;
+      if (stkp->u.repeat.count < reg->repeat_range[mem].upper) {
+        if (stkp->u.repeat.count >= reg->repeat_range[mem].lower) {
+          UChar* pcode = stkp->u.repeat.pcode;
+
+          STACK_PUSH_REPEAT_INC(si);
+          STACK_PUSH_ALT(pcode, s, sprev);
+        }
+        else {
+          p = stkp->u.repeat.pcode;
+          STACK_PUSH_REPEAT_INC(si);
+        }
+      }
+      else if (stkp->u.repeat.count == reg->repeat_range[mem].upper) {
+        STACK_PUSH_REPEAT_INC(si);
+      }
+      MOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH_AT;
+      continue;
+      break;
+
+    case OP_REPEAT_INC_NG_SG:  MOP_IN(OP_REPEAT_INC_NG_SG);
+      GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
+      STACK_GET_REPEAT(mem, stkp);
+      si = GET_STACK_INDEX(stkp);
+      goto repeat_inc_ng;
+      break;
+
+    case OP_PUSH_POS:  MOP_IN(OP_PUSH_POS);
+      STACK_PUSH_POS(s, sprev);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_POP_POS:  MOP_IN(OP_POP_POS);
+      {
+	STACK_POS_END(stkp);
+	s     = stkp->u.state.pstr;
+	sprev = stkp->u.state.pstr_prev;
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_PUSH_POS_NOT:  MOP_IN(OP_PUSH_POS_NOT);
+      GET_RELADDR_INC(addr, p);
+      STACK_PUSH_POS_NOT(p + addr, s, sprev);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_FAIL_POS:  MOP_IN(OP_FAIL_POS);
+      STACK_POP_TIL_POS_NOT;
+      goto fail;
+      break;
+
+    case OP_PUSH_STOP_BT:  MOP_IN(OP_PUSH_STOP_BT);
+      STACK_PUSH_STOP_BT;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_POP_STOP_BT:  MOP_IN(OP_POP_STOP_BT);
+      STACK_STOP_BT_END;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_LOOK_BEHIND:  MOP_IN(OP_LOOK_BEHIND);
+      GET_LENGTH_INC(tlen, p);
+      s = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
+      if (IS_NULL(s)) goto fail;
+      sprev = (UChar* )onigenc_get_prev_char_head(encode, str, s);
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_PUSH_LOOK_BEHIND_NOT:  MOP_IN(OP_PUSH_LOOK_BEHIND_NOT);
+      GET_RELADDR_INC(addr, p);
+      GET_LENGTH_INC(tlen, p);
+      q = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
+      if (IS_NULL(q)) {
+	/* too short case -> success. ex. /(?<!XXX)a/.match("a")
+	   If you want to change to fail, replace following line. */
+	p += addr;
+	/* goto fail; */
+      }
+      else {
+	STACK_PUSH_LOOK_BEHIND_NOT(p + addr, s, sprev);
+	s = q;
+	sprev = (UChar* )onigenc_get_prev_char_head(encode, str, s);
+      }
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_FAIL_LOOK_BEHIND_NOT:  MOP_IN(OP_FAIL_LOOK_BEHIND_NOT);
+      STACK_POP_TIL_LOOK_BEHIND_NOT;
+      goto fail;
+      break;
+
+#ifdef USE_SUBEXP_CALL
+    case OP_CALL:  MOP_IN(OP_CALL);
+      GET_ABSADDR_INC(addr, p);
+      STACK_PUSH_CALL_FRAME(p);
+      p = reg->p + addr;
+      MOP_OUT;
+      continue;
+      break;
+
+    case OP_RETURN:  MOP_IN(OP_RETURN);
+      STACK_RETURN(p);
+      STACK_PUSH_RETURN;
+      MOP_OUT;
+      continue;
+      break;
+#endif
+
+    case OP_FINISH:
+      goto finish;
+      break;
+
+    fail:
+      MOP_OUT;
+      /* fall */
+    case OP_FAIL:  MOP_IN(OP_FAIL);
+      STACK_POP;
+      p     = stk->u.state.pcode;
+      s     = stk->u.state.pstr;
+      sprev = stk->u.state.pstr_prev;
+
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+      if (stk->u.state.state_check != 0) {
+        stk->type = STK_STATE_CHECK_MARK;
+        stk++;
+      }
+#endif
+
+      MOP_OUT;
+      continue;
+      break;
+
+    default:
+      goto bytecode_error;
+
+    } /* end of switch */
+    sprev = sbegin;
+  } /* end of while(1) */
+
+ finish:
+  STACK_SAVE;
+  return best_len;
+
+#ifdef ONIG_DEBUG
+ stack_error:
+  STACK_SAVE;
+  return ONIGERR_STACK_BUG;
+#endif
+
+ bytecode_error:
+  STACK_SAVE;
+  return ONIGERR_UNDEFINED_BYTECODE;
+
+ unexpected_bytecode_error:
+  STACK_SAVE;
+  return ONIGERR_UNEXPECTED_BYTECODE;
+}
+
+
+static UChar*
+slow_search(OnigEncoding enc, UChar* target, UChar* target_end,
+	    const UChar* text, const UChar* text_end, UChar* text_range)
+{
+  UChar *t, *p, *s, *end;
+
+  end = (UChar* )text_end;
+  end -= target_end - target - 1;
+  if (end > text_range)
+    end = text_range;
+
+  s = (UChar* )text;
+
+  while (s < end) {
+    if (*s == *target) {
+      p = s + 1;
+      t = target + 1;
+      while (t < target_end) {
+	if (*t != *p++)
+	  break;
+	t++;
+      }
+      if (t == target_end)
+	return s;
+    }
+    s += enclen(enc, s);
+  }
+
+  return (UChar* )NULL;
+}
+
+static int
+str_lower_case_match(OnigEncoding enc, int case_fold_flag,
+                     const UChar* t, const UChar* tend,
+		     const UChar* p, const UChar* end)
+{
+  int lowlen;
+  UChar *q, lowbuf[ONIGENC_MBC_CASE_FOLD_MAXLEN];
+
+  while (t < tend) {
+    lowlen = ONIGENC_MBC_CASE_FOLD(enc, case_fold_flag, &p, end, lowbuf);
+    q = lowbuf;
+    while (lowlen > 0) {
+      if (*t++ != *q++)	return 0;
+      lowlen--;
+    }
+  }
+
+  return 1;
+}
+
+static UChar*
+slow_search_ic(OnigEncoding enc, int case_fold_flag,
+	       UChar* target, UChar* target_end,
+	       const UChar* text, const UChar* text_end, UChar* text_range)
+{
+  UChar *s, *end;
+
+  end = (UChar* )text_end;
+  end -= target_end - target - 1;
+  if (end > text_range)
+    end = text_range;
+
+  s = (UChar* )text;
+
+  while (s < end) {
+    if (str_lower_case_match(enc, case_fold_flag, target, target_end,
+			     s, text_end))
+      return s;
+
+    s += enclen(enc, s);
+  }
+
+  return (UChar* )NULL;
+}
+
+static UChar*
+slow_search_backward(OnigEncoding enc, UChar* target, UChar* target_end,
+		     const UChar* text, const UChar* adjust_text,
+		     const UChar* text_end, const UChar* text_start)
+{
+  UChar *t, *p, *s;
+
+  s = (UChar* )text_end;
+  s -= (target_end - target);
+  if (s > text_start)
+    s = (UChar* )text_start;
+  else
+    s = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, adjust_text, s);
+
+  while (s >= text) {
+    if (*s == *target) {
+      p = s + 1;
+      t = target + 1;
+      while (t < target_end) {
+	if (*t != *p++)
+	  break;
+	t++;
+      }
+      if (t == target_end)
+	return s;
+    }
+    s = (UChar* )onigenc_get_prev_char_head(enc, adjust_text, s);
+  }
+
+  return (UChar* )NULL;
+}
+
+static UChar*
+slow_search_backward_ic(OnigEncoding enc, int case_fold_flag,
+			UChar* target, UChar* target_end,
+			const UChar* text, const UChar* adjust_text,
+			const UChar* text_end, const UChar* text_start)
+{
+  UChar *s;
+
+  s = (UChar* )text_end;
+  s -= (target_end - target);
+  if (s > text_start)
+    s = (UChar* )text_start;
+  else
+    s = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, adjust_text, s);
+
+  while (s >= text) {
+    if (str_lower_case_match(enc, case_fold_flag,
+                             target, target_end, s, text_end))
+      return s;
+
+    s = (UChar* )onigenc_get_prev_char_head(enc, adjust_text, s);
+  }
+
+  return (UChar* )NULL;
+}
+
+static UChar*
+bm_search_notrev(regex_t* reg, const UChar* target, const UChar* target_end,
+		 const UChar* text, const UChar* text_end,
+		 const UChar* text_range)
+{
+  const UChar *s, *se, *t, *p, *end;
+  const UChar *tail;
+  int skip, tlen1;
+
+#ifdef ONIG_DEBUG_SEARCH
+  fprintf(stderr, "bm_search_notrev: text: %d, text_end: %d, text_range: %d\n",
+	  (int )text, (int )text_end, (int )text_range);
+#endif
+
+  tail = target_end - 1;
+  tlen1 = tail - target;
+  end = text_range;
+  if (end + tlen1 > text_end)
+    end = text_end - tlen1;
+
+  s = text;
+
+  if (IS_NULL(reg->int_map)) {
+    while (s < end) {
+      p = se = s + tlen1;
+      t = tail;
+      while (*p == *t) {
+	if (t == target) return (UChar* )s;
+	p--; t--;
+      }
+      skip = reg->map[*se];
+      t = s;
+      do {
+        s += enclen(reg->enc, s);
+      } while ((s - t) < skip && s < end);
+    }
+  }
+  else {
+    while (s < end) {
+      p = se = s + tlen1;
+      t = tail;
+      while (*p == *t) {
+	if (t == target) return (UChar* )s;
+	p--; t--;
+      }
+      skip = reg->int_map[*se];
+      t = s;
+      do {
+        s += enclen(reg->enc, s);
+      } while ((s - t) < skip && s < end);
+    }
+  }
+
+  return (UChar* )NULL;
+}
+
+static UChar*
+bm_search(regex_t* reg, const UChar* target, const UChar* target_end,
+	  const UChar* text, const UChar* text_end, const UChar* text_range)
+{
+  const UChar *s, *t, *p, *end;
+  const UChar *tail;
+
+  end = text_range + (target_end - target) - 1;
+  if (end > text_end)
+    end = text_end;
+
+  tail = target_end - 1;
+  s = text + (target_end - target) - 1;
+  if (IS_NULL(reg->int_map)) {
+    while (s < end) {
+      p = s;
+      t = tail;
+      while (*p == *t) {
+	if (t == target) return (UChar* )p;
+	p--; t--;
+      }
+      s += reg->map[*s];
+    }
+  }
+  else { /* see int_map[] */
+    while (s < end) {
+      p = s;
+      t = tail;
+      while (*p == *t) {
+	if (t == target) return (UChar* )p;
+	p--; t--;
+      }
+      s += reg->int_map[*s];
+    }
+  }
+  return (UChar* )NULL;
+}
+
+static int
+set_bm_backward_skip(UChar* s, UChar* end, OnigEncoding enc ARG_UNUSED,
+		     int** skip)
+		     
+{
+  int i, len;
+
+  if (IS_NULL(*skip)) {
+    *skip = (int* )xmalloc(sizeof(int) * ONIG_CHAR_TABLE_SIZE);
+    if (IS_NULL(*skip)) return ONIGERR_MEMORY;
+  }
+
+  len = end - s;
+  for (i = 0; i < ONIG_CHAR_TABLE_SIZE; i++)
+    (*skip)[i] = len;
+
+  for (i = len - 1; i > 0; i--)
+    (*skip)[s[i]] = i;
+
+  return 0;
+}
+
+static UChar*
+bm_search_backward(regex_t* reg, const UChar* target, const UChar* target_end,
+		   const UChar* text, const UChar* adjust_text,
+		   const UChar* text_end, const UChar* text_start)
+{
+  const UChar *s, *t, *p;
+
+  s = text_end - (target_end - target);
+  if (text_start < s)
+    s = text_start;
+  else
+    s = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc, adjust_text, s);
+
+  while (s >= text) {
+    p = s;
+    t = target;
+    while (t < target_end && *p == *t) {
+      p++; t++;
+    }
+    if (t == target_end)
+      return (UChar* )s;
+
+    s -= reg->int_map_backward[*s];
+    s = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc, adjust_text, s);
+  }
+
+  return (UChar* )NULL;
+}
+
+static UChar*
+map_search(OnigEncoding enc, UChar map[],
+	   const UChar* text, const UChar* text_range)
+{
+  const UChar *s = text;
+
+  while (s < text_range) {
+    if (map[*s]) return (UChar* )s;
+
+    s += enclen(enc, s);
+  }
+  return (UChar* )NULL;
+}
+
+static UChar*
+map_search_backward(OnigEncoding enc, UChar map[],
+		    const UChar* text, const UChar* adjust_text,
+		    const UChar* text_start)
+{
+  const UChar *s = text_start;
+
+  while (s >= text) {
+    if (map[*s]) return (UChar* )s;
+
+    s = onigenc_get_prev_char_head(enc, adjust_text, s);
+  }
+  return (UChar* )NULL;
+}
+
+extern int
+onig_match(regex_t* reg, const UChar* str, const UChar* end, const UChar* at, OnigRegion* region,
+	    OnigOptionType option)
+{
+  int r;
+  UChar *prev;
+  OnigMatchArg msa;
+
+  MATCH_ARG_INIT(msa, option, region, at);
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+  {
+    int offset = at - str;
+    STATE_CHECK_BUFF_INIT(msa, end - str, offset, reg->num_comb_exp_check);
+  }
+#endif
+
+  if (region
+#ifdef USE_POSIX_API_REGION_OPTION
+      && !IS_POSIX_REGION(option)
+#endif
+      ) {
+    r = onig_region_resize_clear(region, reg->num_mem + 1);
+  }
+  else
+    r = 0;
+
+  if (r == 0) {
+    prev = (UChar* )onigenc_get_prev_char_head(reg->enc, str, at);
+    r = match_at(reg, str, end,
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+		 end,
+#endif
+		 at, prev, &msa);
+  }
+
+  MATCH_ARG_FREE(msa);
+  return r;
+}
+
+static int
+forward_search_range(regex_t* reg, const UChar* str, const UChar* end, UChar* s,
+		     UChar* range, UChar** low, UChar** high, UChar** low_prev)
+{
+  UChar *p, *pprev = (UChar* )NULL;
+
+#ifdef ONIG_DEBUG_SEARCH
+  fprintf(stderr, "forward_search_range: str: %d, end: %d, s: %d, range: %d\n",
+	  (int )str, (int )end, (int )s, (int )range);
+#endif
+
+  p = s;
+  if (reg->dmin > 0) {
+    if (ONIGENC_IS_SINGLEBYTE(reg->enc)) {
+      p += reg->dmin;
+    }
+    else {
+      UChar *q = p + reg->dmin;
+      while (p < q) p += enclen(reg->enc, p);
+    }
+  }
+
+ retry:
+  switch (reg->optimize) {
+  case ONIG_OPTIMIZE_EXACT:
+    p = slow_search(reg->enc, reg->exact, reg->exact_end, p, end, range);
+    break;
+  case ONIG_OPTIMIZE_EXACT_IC:
+    p = slow_search_ic(reg->enc, reg->case_fold_flag,
+                       reg->exact, reg->exact_end, p, end, range);
+    break;
+
+  case ONIG_OPTIMIZE_EXACT_BM:
+    p = bm_search(reg, reg->exact, reg->exact_end, p, end, range);
+    break;
+
+  case ONIG_OPTIMIZE_EXACT_BM_NOT_REV:
+    p = bm_search_notrev(reg, reg->exact, reg->exact_end, p, end, range);
+    break;
+
+  case ONIG_OPTIMIZE_MAP:
+    p = map_search(reg->enc, reg->map, p, range);
+    break;
+  }
+
+  if (p && p < range) {
+    if (p - reg->dmin < s) {
+    retry_gate:
+      pprev = p;
+      p += enclen(reg->enc, p);
+      goto retry;
+    }
+
+    if (reg->sub_anchor) {
+      UChar* prev;
+
+      switch (reg->sub_anchor) {
+      case ANCHOR_BEGIN_LINE:
+	if (!ON_STR_BEGIN(p)) {
+	  prev = onigenc_get_prev_char_head(reg->enc,
+					    (pprev ? pprev : str), p);
+	  if (!ONIGENC_IS_MBC_NEWLINE(reg->enc, prev, end))
+	    goto retry_gate;
+	}
+	break;
+
+      case ANCHOR_END_LINE:
+	if (ON_STR_END(p)) {
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	  prev = (UChar* )onigenc_get_prev_char_head(reg->enc,
+					    (pprev ? pprev : str), p);
+	  if (prev && ONIGENC_IS_MBC_NEWLINE(reg->enc, prev, end))
+	    goto retry_gate;
+#endif
+	}
+	else if (! ONIGENC_IS_MBC_NEWLINE(reg->enc, p, end)
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+              && ! ONIGENC_IS_MBC_CRNL(reg->enc, p, end)
+#endif
+                )
+	  goto retry_gate;
+	break;
+      }
+    }
+
+    if (reg->dmax == 0) {
+      *low = p;
+      if (low_prev) {
+	if (*low > s)
+	  *low_prev = onigenc_get_prev_char_head(reg->enc, s, p);
+	else
+	  *low_prev = onigenc_get_prev_char_head(reg->enc,
+						 (pprev ? pprev : str), p);
+      }
+    }
+    else {
+      if (reg->dmax != ONIG_INFINITE_DISTANCE) {
+	*low = p - reg->dmax;
+	if (*low > s) {
+	  *low = onigenc_get_right_adjust_char_head_with_prev(reg->enc, s,
+							      *low, (const UChar** )low_prev);
+	  if (low_prev && IS_NULL(*low_prev))
+	    *low_prev = onigenc_get_prev_char_head(reg->enc,
+						   (pprev ? pprev : s), *low);
+	}
+	else {
+	  if (low_prev)
+	    *low_prev = onigenc_get_prev_char_head(reg->enc,
+					       (pprev ? pprev : str), *low);
+	}
+      }
+    }
+    /* no needs to adjust *high, *high is used as range check only */
+    *high = p - reg->dmin;
+
+#ifdef ONIG_DEBUG_SEARCH
+    fprintf(stderr,
+    "forward_search_range success: low: %d, high: %d, dmin: %d, dmax: %d\n",
+	    (int )(*low - str), (int )(*high - str), reg->dmin, reg->dmax);
+#endif
+    return 1; /* success */
+  }
+
+  return 0; /* fail */
+}
+
+static int set_bm_backward_skip P_((UChar* s, UChar* end, OnigEncoding enc,
+				    int** skip));
+
+#define BM_BACKWARD_SEARCH_LENGTH_THRESHOLD   100
+
+static int
+backward_search_range(regex_t* reg, const UChar* str, const UChar* end,
+		      UChar* s, const UChar* range, UChar* adjrange,
+		      UChar** low, UChar** high)
+{
+  int r;
+  UChar *p;
+
+  range += reg->dmin;
+  p = s;
+
+ retry:
+  switch (reg->optimize) {
+  case ONIG_OPTIMIZE_EXACT:
+  exact_method:
+    p = slow_search_backward(reg->enc, reg->exact, reg->exact_end,
+			     range, adjrange, end, p);
+    break;
+
+  case ONIG_OPTIMIZE_EXACT_IC:
+    p = slow_search_backward_ic(reg->enc, reg->case_fold_flag,
+                                reg->exact, reg->exact_end,
+                                range, adjrange, end, p);
+    break;
+
+  case ONIG_OPTIMIZE_EXACT_BM:
+  case ONIG_OPTIMIZE_EXACT_BM_NOT_REV:
+    if (IS_NULL(reg->int_map_backward)) {
+      if (s - range < BM_BACKWARD_SEARCH_LENGTH_THRESHOLD)
+	goto exact_method;
+
+      r = set_bm_backward_skip(reg->exact, reg->exact_end, reg->enc,
+			       &(reg->int_map_backward));
+      if (r) return r;
+    }
+    p = bm_search_backward(reg, reg->exact, reg->exact_end, range, adjrange,
+			   end, p);
+    break;
+
+  case ONIG_OPTIMIZE_MAP:
+    p = map_search_backward(reg->enc, reg->map, range, adjrange, p);
+    break;
+  }
+
+  if (p) {
+    if (reg->sub_anchor) {
+      UChar* prev;
+
+      switch (reg->sub_anchor) {
+      case ANCHOR_BEGIN_LINE:
+	if (!ON_STR_BEGIN(p)) {
+	  prev = onigenc_get_prev_char_head(reg->enc, str, p);
+	  if (!ONIGENC_IS_MBC_NEWLINE(reg->enc, prev, end)) {
+	    p = prev;
+	    goto retry;
+	  }
+	}
+	break;
+
+      case ANCHOR_END_LINE:
+	if (ON_STR_END(p)) {
+#ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
+	  prev = onigenc_get_prev_char_head(reg->enc, adjrange, p);
+	  if (IS_NULL(prev)) goto fail;
+	  if (ONIGENC_IS_MBC_NEWLINE(reg->enc, prev, end)) {
+	    p = prev;
+	    goto retry;
+	  }
+#endif
+	}
+	else if (! ONIGENC_IS_MBC_NEWLINE(reg->enc, p, end)
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+              && ! ONIGENC_IS_MBC_CRNL(reg->enc, p, end)
+#endif
+                ) {
+	  p = onigenc_get_prev_char_head(reg->enc, adjrange, p);
+	  if (IS_NULL(p)) goto fail;
+	  goto retry;
+	}
+	break;
+      }
+    }
+
+    /* no needs to adjust *high, *high is used as range check only */
+    if (reg->dmax != ONIG_INFINITE_DISTANCE) {
+      *low  = p - reg->dmax;
+      *high = p - reg->dmin;
+      *high = onigenc_get_right_adjust_char_head(reg->enc, adjrange, *high);
+    }
+
+#ifdef ONIG_DEBUG_SEARCH
+    fprintf(stderr, "backward_search_range: low: %d, high: %d\n",
+	    (int )(*low - str), (int )(*high - str));
+#endif
+    return 1; /* success */
+  }
+
+ fail:
+#ifdef ONIG_DEBUG_SEARCH
+  fprintf(stderr, "backward_search_range: fail.\n");
+#endif
+  return 0; /* fail */
+}
+
+
+extern int
+onig_search(regex_t* reg, const UChar* str, const UChar* end,
+	    const UChar* start, const UChar* range, OnigRegion* region, OnigOptionType option)
+{
+  int r;
+  UChar *s, *prev;
+  OnigMatchArg msa;
+  const UChar *orig_start = start;
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+  const UChar *orig_range = range;
+#endif
+
+#ifdef ONIG_DEBUG_SEARCH
+  fprintf(stderr,
+     "onig_search (entry point): str: %d, end: %d, start: %d, range: %d\n",
+     (int )str, (int )(end - str), (int )(start - str), (int )(range - str));
+#endif
+
+  if (region
+#ifdef USE_POSIX_API_REGION_OPTION
+      && !IS_POSIX_REGION(option)
+#endif
+      ) {
+    r = onig_region_resize_clear(region, reg->num_mem + 1);
+    if (r) goto finish_no_msa;
+  }
+
+  if (start > end || start < str) goto mismatch_no_msa;
+
+
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+#define MATCH_AND_RETURN_CHECK(upper_range) \
+  r = match_at(reg, str, end, (upper_range), s, prev, &msa); \
+  if (r != ONIG_MISMATCH) {\
+    if (r >= 0) {\
+      if (! IS_FIND_LONGEST(reg->options)) {\
+        goto match;\
+      }\
+    }\
+    else goto finish; /* error */ \
+  }
+#else
+#define MATCH_AND_RETURN_CHECK(upper_range) \
+  r = match_at(reg, str, end, (upper_range), s, prev, &msa); \
+  if (r != ONIG_MISMATCH) {\
+    if (r >= 0) {\
+      goto match;\
+    }\
+    else goto finish; /* error */ \
+  }
+#endif /* USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE */
+#else
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+#define MATCH_AND_RETURN_CHECK(none) \
+  r = match_at(reg, str, end, s, prev, &msa);\
+  if (r != ONIG_MISMATCH) {\
+    if (r >= 0) {\
+      if (! IS_FIND_LONGEST(reg->options)) {\
+        goto match;\
+      }\
+    }\
+    else goto finish; /* error */ \
+  }
+#else
+#define MATCH_AND_RETURN_CHECK(none) \
+  r = match_at(reg, str, end, s, prev, &msa);\
+  if (r != ONIG_MISMATCH) {\
+    if (r >= 0) {\
+      goto match;\
+    }\
+    else goto finish; /* error */ \
+  }
+#endif /* USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE */
+#endif /* USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE */
+
+
+  /* anchor optimize: resume search range */
+  if (reg->anchor != 0 && str < end) {
+    UChar *min_semi_end, *max_semi_end;
+
+    if (reg->anchor & ANCHOR_BEGIN_POSITION) {
+      /* search start-position only */
+    begin_position:
+      if (range > start)
+	range = start + 1;
+      else
+	range = start;
+    }
+    else if (reg->anchor & ANCHOR_BEGIN_BUF) {
+      /* search str-position only */
+      if (range > start) {
+	if (start != str) goto mismatch_no_msa;
+	range = str + 1;
+      }
+      else {
+	if (range <= str) {
+	  start = str;
+	  range = str;
+	}
+	else
+	  goto mismatch_no_msa;
+      }
+    }
+    else if (reg->anchor & ANCHOR_END_BUF) {
+      min_semi_end = max_semi_end = (UChar* )end;
+
+    end_buf:
+      if ((OnigDistance )(max_semi_end - str) < reg->anchor_dmin)
+	goto mismatch_no_msa;
+
+      if (range > start) {
+	if ((OnigDistance )(min_semi_end - start) > reg->anchor_dmax) {
+	  start = min_semi_end - reg->anchor_dmax;
+	  if (start < end)
+	    start = onigenc_get_right_adjust_char_head(reg->enc, str, start);
+	  else { /* match with empty at end */
+	    start = onigenc_get_prev_char_head(reg->enc, str, end);
+	  }
+	}
+	if ((OnigDistance )(max_semi_end - (range - 1)) < reg->anchor_dmin) {
+	  range = max_semi_end - reg->anchor_dmin + 1;
+	}
+
+	if (start >= range) goto mismatch_no_msa;
+      }
+      else {
+	if ((OnigDistance )(min_semi_end - range) > reg->anchor_dmax) {
+	  range = min_semi_end - reg->anchor_dmax;
+	}
+	if ((OnigDistance )(max_semi_end - start) < reg->anchor_dmin) {
+	  start = max_semi_end - reg->anchor_dmin;
+	  start = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc, str, start);
+	}
+	if (range > start) goto mismatch_no_msa;
+      }
+    }
+    else if (reg->anchor & ANCHOR_SEMI_END_BUF) {
+      UChar* pre_end = ONIGENC_STEP_BACK(reg->enc, str, end, 1);
+
+      max_semi_end = (UChar* )end;
+      if (ONIGENC_IS_MBC_NEWLINE(reg->enc, pre_end, end)) {
+	min_semi_end = pre_end;
+
+#ifdef USE_CRNL_AS_LINE_TERMINATOR
+	pre_end = ONIGENC_STEP_BACK(reg->enc, str, pre_end, 1);
+	if (IS_NOT_NULL(pre_end) &&
+	    ONIGENC_IS_MBC_CRNL(reg->enc, pre_end, end)) {
+	  min_semi_end = pre_end;
+	}
+#endif
+	if (min_semi_end > str && start <= min_semi_end) {
+	  goto end_buf;
+	}
+      }
+      else {
+	min_semi_end = (UChar* )end;
+	goto end_buf;
+      }
+    }
+    else if ((reg->anchor & ANCHOR_ANYCHAR_STAR_ML)) {
+      goto begin_position;
+    }
+  }
+  else if (str == end) { /* empty string */
+    static const UChar* address_for_empty_string = (UChar* )"";
+
+#ifdef ONIG_DEBUG_SEARCH
+    fprintf(stderr, "onig_search: empty string.\n");
+#endif
+
+    if (reg->threshold_len == 0) {
+      start = end = str = address_for_empty_string;
+      s = (UChar* )start;
+      prev = (UChar* )NULL;
+
+      MATCH_ARG_INIT(msa, option, region, start);
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+      msa.state_check_buff = (void* )0;
+      msa.state_check_buff_size = 0;   /* NO NEED, for valgrind */
+#endif
+      MATCH_AND_RETURN_CHECK(end);
+      goto mismatch;
+    }
+    goto mismatch_no_msa;
+  }
+
+#ifdef ONIG_DEBUG_SEARCH
+  fprintf(stderr, "onig_search(apply anchor): end: %d, start: %d, range: %d\n",
+	  (int )(end - str), (int )(start - str), (int )(range - str));
+#endif
+
+  MATCH_ARG_INIT(msa, option, region, orig_start);
+#ifdef USE_COMBINATION_EXPLOSION_CHECK
+  {
+    int offset = (MIN(start, range) - str);
+    STATE_CHECK_BUFF_INIT(msa, end - str, offset, reg->num_comb_exp_check);
+  }
+#endif
+
+  s = (UChar* )start;
+  if (range > start) {   /* forward search */
+    if (s > str)
+      prev = onigenc_get_prev_char_head(reg->enc, str, s);
+    else
+      prev = (UChar* )NULL;
+
+    if (reg->optimize != ONIG_OPTIMIZE_NONE) {
+      UChar *sch_range, *low, *high, *low_prev;
+
+      sch_range = (UChar* )range;
+      if (reg->dmax != 0) {
+	if (reg->dmax == ONIG_INFINITE_DISTANCE)
+	  sch_range = (UChar* )end;
+	else {
+	  sch_range += reg->dmax;
+	  if (sch_range > end) sch_range = (UChar* )end;
+	}
+      }
+
+      if ((end - start) < reg->threshold_len)
+        goto mismatch;
+
+      if (reg->dmax != ONIG_INFINITE_DISTANCE) {
+	do {
+	  if (! forward_search_range(reg, str, end, s, sch_range,
+				     &low, &high, &low_prev)) goto mismatch;
+	  if (s < low) {
+	    s    = low;
+	    prev = low_prev;
+	  }
+	  while (s <= high) {
+	    MATCH_AND_RETURN_CHECK(orig_range);
+	    prev = s;
+	    s += enclen(reg->enc, s);
+	  }
+	} while (s < range);
+	goto mismatch;
+      }
+      else { /* check only. */
+	if (! forward_search_range(reg, str, end, s, sch_range,
+				   &low, &high, (UChar** )NULL)) goto mismatch;
+
+        if ((reg->anchor & ANCHOR_ANYCHAR_STAR) != 0) {
+          do {
+            MATCH_AND_RETURN_CHECK(orig_range);
+            prev = s;
+            s += enclen(reg->enc, s);
+
+            while (!ONIGENC_IS_MBC_NEWLINE(reg->enc, prev, end) && s < range) {
+              prev = s;
+              s += enclen(reg->enc, s);
+            }
+          } while (s < range);
+          goto mismatch;
+        }
+      }
+    }
+
+    do {
+      MATCH_AND_RETURN_CHECK(orig_range);
+      prev = s;
+      s += enclen(reg->enc, s);
+    } while (s < range);
+
+    if (s == range) { /* because empty match with /$/. */
+      MATCH_AND_RETURN_CHECK(orig_range);
+    }
+  }
+  else {  /* backward search */
+#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
+    if (orig_start < end)
+      orig_start += enclen(reg->enc, orig_start); /* is upper range */
+#endif
+
+    if (reg->optimize != ONIG_OPTIMIZE_NONE) {
+      UChar *low, *high, *adjrange, *sch_start;
+
+      if (range < end)
+	adjrange = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc, str, range);
+      else
+	adjrange = (UChar* )end;
+
+      if (reg->dmax != ONIG_INFINITE_DISTANCE &&
+	  (end - range) >= reg->threshold_len) {
+	do {
+	  sch_start = s + reg->dmax;
+	  if (sch_start > end) sch_start = (UChar* )end;
+	  if (backward_search_range(reg, str, end, sch_start, range, adjrange,
+				    &low, &high) <= 0)
+	    goto mismatch;
+
+	  if (s > high)
+	    s = high;
+
+	  while (s >= low) {
+	    prev = onigenc_get_prev_char_head(reg->enc, str, s);
+	    MATCH_AND_RETURN_CHECK(orig_start);
+	    s = prev;
+	  }
+	} while (s >= range);
+	goto mismatch;
+      }
+      else { /* check only. */
+	if ((end - range) < reg->threshold_len) goto mismatch;
+
+	sch_start = s;
+	if (reg->dmax != 0) {
+	  if (reg->dmax == ONIG_INFINITE_DISTANCE)
+	    sch_start = (UChar* )end;
+	  else {
+	    sch_start += reg->dmax;
+	    if (sch_start > end) sch_start = (UChar* )end;
+	    else
+	      sch_start = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc,
+						    start, sch_start);
+	  }
+	}
+	if (backward_search_range(reg, str, end, sch_start, range, adjrange,
+				  &low, &high) <= 0) goto mismatch;
+      }
+    }
+
+    do {
+      prev = onigenc_get_prev_char_head(reg->enc, str, s);
+      MATCH_AND_RETURN_CHECK(orig_start);
+      s = prev;
+    } while (s >= range);
+  }
+
+ mismatch:
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+  if (IS_FIND_LONGEST(reg->options)) {
+    if (msa.best_len >= 0) {
+      s = msa.best_s;
+      goto match;
+    }
+  }
+#endif
+  r = ONIG_MISMATCH;
+
+ finish:
+  MATCH_ARG_FREE(msa);
+
+  /* If result is mismatch and no FIND_NOT_EMPTY option,
+     then the region is not setted in match_at(). */
+  if (IS_FIND_NOT_EMPTY(reg->options) && region
+#ifdef USE_POSIX_API_REGION_OPTION
+      && !IS_POSIX_REGION(option)
+#endif
+      ) {
+    onig_region_clear(region);
+  }
+
+#ifdef ONIG_DEBUG
+  if (r != ONIG_MISMATCH)
+    fprintf(stderr, "onig_search: error %d\n", r);
+#endif
+  return r;
+
+ mismatch_no_msa:
+  r = ONIG_MISMATCH;
+ finish_no_msa:
+#ifdef ONIG_DEBUG
+  if (r != ONIG_MISMATCH)
+    fprintf(stderr, "onig_search: error %d\n", r);
+#endif
+  return r;
+
+ match:
+  MATCH_ARG_FREE(msa);
+  return s - str;
+}
+
+extern OnigEncoding
+onig_get_encoding(regex_t* reg)
+{
+  return reg->enc;
+}
+
+extern OnigOptionType
+onig_get_options(regex_t* reg)
+{
+  return reg->options;
+}
+
+extern  OnigCaseFoldType
+onig_get_case_fold_flag(regex_t* reg)
+{
+  return reg->case_fold_flag;
+}
+
+extern OnigSyntaxType*
+onig_get_syntax(regex_t* reg)
+{
+  return reg->syntax;
+}
+
+extern int
+onig_number_of_captures(regex_t* reg)
+{
+  return reg->num_mem;
+}
+
+extern int
+onig_number_of_capture_histories(regex_t* reg)
+{
+#ifdef USE_CAPTURE_HISTORY
+  int i, n;
+
+  n = 0;
+  for (i = 0; i <= ONIG_MAX_CAPTURE_HISTORY_GROUP; i++) {
+    if (BIT_STATUS_AT(reg->capture_history, i) != 0)
+      n++;
+  }
+  return n;
+#else
+  return 0;
+#endif
+}
+
+extern void
+onig_copy_encoding(OnigEncoding to, OnigEncoding from)
+{
+  *to = *from;
+}
+