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<?php if (preg_match('#^(\d{2}){1}/(\d{2}){1}/(\d{4}){1}$#', '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(4) { [0]=> string(10) "22/01/1962" [1]=> string(2) "22" [2]=> string(2) "01" [3]=> string(4) "1962" }