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<?php $expression = "3rd from end"; preg_match('~^(?:(?P<offset>[0-9]+)(?:st|nd|rd|th)* from )*(?P<position>start|beginning|last|end)+$~', $expression, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(12) "3rd from end" ["offset"]=> string(1) "3" [1]=> string(1) "3" ["position"]=> string(3) "end" [2]=> string(3) "end" }

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