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<?php if (preg_match('#^[0-9]{2}/[0-9]{2}/[0-9]{4}$#', '22/01/1962', $matches)) { var_dump($matches); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(10) "22/01/1962" }