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<?php $string = '(ab(cd)ef))'; preg_match_all('@\( ( ( (?>[^()]+) | (?R) )+ ) \)@x', $string, $matches); mb_ereg('\([^()]+\)', $string, $regs); var_dump($matches, $regs);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(1) { [0]=> string(10) "(ab(cd)ef)" } [1]=> array(1) { [0]=> string(8) "ab(cd)ef" } [2]=> array(1) { [0]=> string(2) "ef" } } array(1) { [0]=> string(4) "(cd)" }

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