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<?php $subject = "3 from last"; preg_match('~(?:(?P<index>[0-9]+)st|nd|rd|th)* from (?P<position>last|end|start|beginning)+~', $subject, $matches); var_dump($matches);
Output for 4.3.3 - 7.1.0
array(5) { [0]=> string(10) " from last" ["index"]=> string(0) "" [1]=> string(0) "" ["position"]=> string(4) "last" [2]=> string(4) "last" }
Output for 4.3.0 - 4.3.2
array(3) { [0]=> string(10) " from last" [1]=> string(0) "" [2]=> string(4) "last" }