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<?php $string = "($a * 10 + $b) Euro and (10 + 2) cents"; $regex = '#\((([^()]+|(?R))*)\)#'; if (preg_match_all($regex, $string ,$matches)) { echo var_export($matches[1], true); } else { //no parenthesis echo $string; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a in /in/taQYB on line 2 Warning: Undefined variable $b in /in/taQYB on line 2 array ( 0 => ' * 10 + ', 1 => '10 + 2', )

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