3v4l.org

run code in 300+ PHP versions simultaneously
<?php $date = "13/23/15"; echo $x = '~^(?:' . implode('|', range(1, 12)) . ')\/(?:' . implode('|', range(1, 31)) . ')\/[0-9]{2}$~'; preg_match($x, $date, $m); var_dump($m);

preferences:
61.68 ms | 402 KiB | 5 Q