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<?php $expression = "3rd from last"; preg_match('~^(?P<offset>[0-9]+)(?:st|nd|rd|th)* from (?P<position>start|beginning|last|end|)+$~', $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(13) "3rd from last" ["offset"]=> string(1) "3" [1]=> string(1) "3" ["position"]=> string(0) "" [2]=> string(0) "" }
Output for 4.3.0 - 4.3.2
array(3) { [0]=> string(13) "3rd from last" [1]=> string(1) "3" [2]=> string(0) "" }