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<?php preg_match('/^(\d{1,2}([a-z]+))(?:\s*)\S+ (?:200[0-9])/', '21st March 2006', $matches); print_r($matches); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 21st March 2006 [1] => 21st [2] => st )