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<?php $subject = "3rd from last"; preg_match('~^(?P<index>([0-9]+))st|nd|rd|th from (?P<position>(last|end|start|beginning))$~', $subject, $matches); var_dump($matches);
Output for 4.3.0 - 5.6.26, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(1) { [0]=> string(2) "rd" }