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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match("/((X))+/", 'X', $matches)); var_dump(preg_match("/((X))+/", str_repeat('X', 1024), $matches));
based on 1u4ga
Output for 5.3.22 - 5.6.28, 7.0.6 - 7.2.0
int(1) int(1)
Output for 7.0.0 - 7.0.5
int(1) bool(false)