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diff --git a/contributed/libfuzzer-onig.cpp b/contributed/libfuzzer-onig.cpp
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+++ b/contributed/libfuzzer-onig.cpp
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+/* libfuzzer test code for oniguruma
+ * author: Hanno Böck, license: CC0/public domain
+
+Usage:
+* compile oniguruma with something like
+	./configure CC=clang LD=clang CFLAGS="-fsanitize-coverage=edge -fsanitize=address" \
+		LDFLAGS="-fsanitize-coverage=edge -fsanitize=address"
+* Compile libfuzzer stub and link against static libonig.a and libFuzzer.a:
+	clang++ libfuzzer-onig.cpp src/.libs/libonig.a libFuzzer.a -o libfuzzer-onig \
+		-fsanitize-coverage=edge -fsanitize=address
+* Put sample patterns in directory "in/"
+* Run
+	./libfuzzer-onig in
+
+Consult libfuzzer docs for further details and how to create libFuzzer.a:
+http://llvm.org/docs/LibFuzzer.html
+
+ */
+#include <stdint.h>
+#include <string.h>
+#include <oniguruma.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t * Data, size_t Size)
+{
+	regex_t *reg;
+	if (onig_new
+	    (&reg, Data, Data + Size, ONIG_OPTION_DEFAULT, ONIG_ENCODING_UTF8,
+	     ONIG_SYNTAX_DEFAULT, 0) == 0)
+		onig_free(reg);
+	return 0;
+}