3v4l.org

run code in 150+ php & hhvm versions
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<?php preg_match("/(\w+)?/", "validation/aa/1/",$matches); print_r($matches); echo "\n";
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => validation [1] => validation )
Output for hhvm-3.10.0

Process exited with code 153.