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<?php $subject = "3 from last"; preg_match('~^(?P<index>([0-9]+)) from (?P<position>(last|end|start|beginning))$~', $subject, $matches); var_dump($matches);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(7) { [0]=> string(11) "3 from last" ["index"]=> string(1) "3" [1]=> string(1) "3" [2]=> string(1) "3" ["position"]=> string(4) "last" [3]=> string(4) "last" [4]=> string(4) "last" }
Output for 4.3.0 - 4.3.2
array(5) { [0]=> string(11) "3 from last" [1]=> string(1) "3" [2]=> string(1) "3" [3]=> string(4) "last" [4]=> string(4) "last" }