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<?php $string = "this (is (a) test) with (two parenthesis) duh"; $regex = '#\((([^()]+|(?R))*)\)#'; if (preg_match_all($regex, $string ,$matches)) { echo implode(' ', $matches[1]); } else { //no parenthesis echo $string; }
Output for git.master, git.master_jit, rfc.property-hooks
is (a) test two parenthesis

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