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<?php $subject = "3rd from last"; preg_match('~(?P<index>([0-9]+))rd|st from (?P<position>(last|end|start|beginning)+)~', $subject, $matches); var_dump($matches);
Output for 4.3.3 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(3) "3rd" ["index"]=> string(1) "3" [1]=> string(1) "3" [2]=> string(1) "3" }
Output for 4.3.0 - 4.3.2
array(3) { [0]=> string(3) "3rd" [1]=> string(1) "3" [2]=> string(1) "3" }