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<?php $re = '%^ ((?=x))? ((?=y))? (\w) $%mx'; $str = 'x y z'; preg_match_all($re, $str, $matches, PREG_SET_ORDER | PREG_UNMATCHED_AS_NULL, 0); // Print the entire match result var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(4) { [0]=> string(1) "x" [1]=> string(0) "" [2]=> NULL [3]=> string(1) "x" } [1]=> array(4) { [0]=> string(1) "y" [1]=> NULL [2]=> string(0) "" [3]=> string(1) "y" } [2]=> array(4) { [0]=> string(1) "z" [1]=> NULL [2]=> NULL [3]=> string(1) "z" } }

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