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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 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 - 7.0.33, 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
Warning: preg_match(): Unknown modifier '(' in /in/CCAer on line 2 <pre></pre>
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: preg_match(): Unknown modifier '(' in /in/CCAer on line 2 <pre>Array ( ) </pre>
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '(' in /in/CCAer on line 2 <pre>Array ( ) </pre>

preferences:
277.26 ms | 401 KiB | 452 Q