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<?php $matches = null; preg_match('/^(\d{1,2}([a-z]+)) (?:\s*)\S+ (200[0-9])/', '21st March 2006', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(4) { [0]=> string(15) "21st March 2006" [1]=> string(4) "21st" [2]=> string(2) "st" [3]=> string(4) "2006" }