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<?php $data = [ [ 'blah' => 'reference', ], [ 'A' => 'SMI13', 'B' => '03/12/1940', 'C' => '', ] ]; foreach($data as &$record){ foreach($record as $key => $val){ //you might want to consider using preg_replace_callback instead: if(preg_match("/^(((0[13578]|1[02])\/(0[1-9]|[12]\d|3[01])\/((19|[2-9]\d)\d{2}))|((0[13456789]|1[012])\/(0[1-9]|[12]\d|30)\/((19|[2-9]\d)\d{2}))|(02\/(0[1-9]|1\d|2[0-8])\/((19|[2-9]\d)\d{2}))|(02\/29\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/",$val)) { echo "match! $val \n"; $record [$key] = date("Y-m-d", strtotime($val)); } } } unset($record); var_dump($data);
Output for git.master, git.master_jit, rfc.property-hooks
match! 03/12/1940 array(2) { [0]=> array(1) { ["blah"]=> string(9) "reference" } [1]=> array(3) { ["A"]=> string(5) "SMI13" ["B"]=> string(10) "1940-03-12" ["C"]=> string(0) "" } }

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