RegEx - Grab Function Names And Function Parameter Names From A Text Entry

I am trying to use a regEx to grab Function names and function parameter names from a text entry.

The script is written in javascript and I expect the functions to be in javascript syntax.

For example the code might look like:

Code:
function myFunction1(param1,param2,param3){
some code
}

function myFunction2();

function myFunction3(param);
Whats the best way to accomplish grabbing the function names and parameters?

Should I be breaking it down into multiple regular expressions?