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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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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" }
preferences:
312.08 ms | 401 KiB | 459 Q