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<?php $subject = "3rd from last"; preg_match('~^(?Pindex[0-9]+)st|nd|rd|th from (?P<position>last|end|start|beginning)$~', $subject, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: unrecognized character after (?P at offset 4 in /in/kHuob on line 4 NULL

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