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<?php $expression = "5th from eND"; preg_match('~^(?:(?P<offset>[0-9]+)(?:st|nd|rd|th)* from )*(?P<position>start|beginning|last|end)+$~i', $expression, $matches); var_dump($matches);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(12) "5th from eND" ["offset"]=> string(1) "5" [1]=> string(1) "5" ["position"]=> string(3) "eND" [2]=> string(3) "eND" }
Output for 4.3.0 - 4.3.2
array(3) { [0]=> string(12) "5th from eND" [1]=> string(1) "5" [2]=> string(3) "eND" }