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<?php $subject = '1234567890'; preg_replace_callback( '#^([a-z]+)$|^([0-9]+)$#', function ($m) { var_dump($m); return null === $m[1] ? '1' : 'a'; }, $subject, 1, $count, PREG_UNMATCHED_AS_NULL );
Output for rfc.property-hooks, git.master, git.master_jit
array(3) { [0]=> string(10) "1234567890" [1]=> NULL [2]=> string(10) "1234567890" }

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