regexp: 'a correctly parenthesized substring advanced'

Hi , this is my regex for php to extract php-function-calls from source. It now works for strings like: func1($param,"abc") func1($param1,func2($param2,"abc")) but if i try to catch func1($param1,"(c) by ARTADA for example")´, func2($param2,"786")) it fails because of the paranthesis between the " " . hás anyone an idea of how i can ignore paranthesis between the " " for correct counting the closing paranthesis here is my current regex: /([a-zA-Z]\w*?)\s*(\(((?>.*?)|.*?(?R)*)\))+/msi this looks a little stupid but it catches all function calls within an codeblock without the need of an function delimiter like ; in php I need the functionality for a templating system where the syntax for the templating system would be simpler and resitricted php code that i complete to full working php code. thax a lot for any suggestion