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<?php $date = "13/23/15"; echo $x = '~^(?:' . implode('|', range(1, 12)) . ')\/(?:' . implode('|', range(1, 31)) . ')\/[0-9]{2}$~'; $r = preg_match($x, $date, $m); var_dump($m); var_dump($r);
Output for git.master, git.master_jit, rfc.property-hooks
~^(?:1|2|3|4|5|6|7|8|9|10|11|12)\/(?:1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31)\/[0-9]{2}$~array(0) { } int(0)

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