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<?php preg_match('/^(\d{1,2}([a-z]+))(?:\s*)\S+ (?=200[0-9])/', '21st March 2006', $matches ); var_dump( $matches );
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(11) "21st March " [1]=> string(4) "21st" [2]=> string(2) "st" }