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<?php echo preg_replace_callback('/\d+/', function($match){ var_dump($match); if ($match[1]<100) { return sprintf("%'.03d", $match[1]); } else { return $match[1]; } }, 'H_000100');
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(6) "000100" } Warning: Undefined array key 1 in /in/Ij9BN on line 5 Warning: Undefined array key 1 in /in/Ij9BN on line 6 H_000

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