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diff --git a/ext/mbstring/tests/bug77371.phpt b/ext/mbstring/tests/bug77371.phpt
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+--TEST--
+Bug #77371 (heap buffer overflow in mb regex functions - compile_string_node)
+--SKIPIF--
+<?php extension_loaded('mbstring') or die('skip mbstring not available'); ?>
+--FILE--
+<?php
+var_dump(mb_ereg("()0\xfc00000\xfc00000\xfc00000\xfc",""));
+?>
+--EXPECT--
+bool(false) \ No newline at end of file