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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 git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(13) "3rd from last" ["offset"]=> string(1) "3" [1]=> string(1) "3" ["position"]=> string(0) "" [2]=> string(0) "" }

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