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<?php $date = "4/23/15"; echo $x = '~^(' . implode('|', range(1, 12)) . ')\/(' . implode('|', range(1, 31)) . ')\/[0-9]{2}$~'; preg_match($x, $date, $m); var_dump($m);
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(3) { [0]=> string(7) "4/23/15" [1]=> string(1) "4" [2]=> string(2) "23" }

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