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<?php $res = array(); $btn = "17/08/2014"; preg_match("/^(0[1-9]|[1-2][0-9]|3[0-1])\/(0[1-9]|1[0-2])\/[0-9]{4}$/",$btn,$res); var_dump($res);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(10) "17/08/2014" [1]=> string(2) "17" [2]=> string(2) "08" }