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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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
~^(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" }

preferences:
320.2 ms | 406 KiB | 451 Q