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<?php preg_match('/^((0[0-9])|(1\d)|(2\d)|(3[0-1]))\/((0[0-9])|(1[0-2]))\/(\d{4})$/', '12/03/2014', $matches); echo '<pre>'.print_r($matches, true).'</pre>';
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 - 5.6.40, 7.0.0 - 7.0.33, 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
<pre>Array ( [0] => 12/03/2014 [1] => 12 [2] => [3] => 12 [4] => [5] => [6] => 03 [7] => 03 [8] => [9] => 2014 ) </pre>

preferences:
345.54 ms | 406 KiB | 460 Q