<?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; }
You have javascript disabled. You will not be able to edit any code.