Regular Expression Help

[kentsin at poboxes.com]

Is it possible for regular expression to match optional parameters 
like :

    func(optional parameters)

in which the func name and some optional parameters be match for 
later retrieval. To match the func is easy, but if the optional 
parameters can be 

  ()
  (p)
  (p1, p2)
  ....

is it possible to match these?