Question

I have a method like signature that looks like this:

void methodName(str arg1, int arg2, int arg3 = 4)
{
}

or

str methodName2(int arg1)
{
}

I want to extract only the parameters of this to give

(str arg1, int arg2, int arg3 = 4)
(int arg1)

Here is what I have tried. This never matches for me.

string namePortion = String.Format(@"^.*{0}", "methodName");

Regex rex = new Regex(namePortion + @"\s*(?<params>\(.*\)).*\{", RegexOptions.Compiled | RegexOptions.Multiline);
string parms = "";

Match m = rex.Match(sourceCode);

if (m.Success)
{
    parms = m.Groups["params"].Value;
}

I have also tested this out in RegexBuddy, and it seems to work, so I am not sure what is wrong.

Answer 1

If you’re going VERY broad, the following should work for you:

(?:^|[\r\n])[\w\s]*(?<params>\(.*?\))

To just grab prototypes (and use brace as a delimiter):

(?:^|[\r\n])[\w\s]*(?<params>\(.*?\)).*?\{

If you’re looking for something more specific, let me know.

EDIT Added (?:^|[\r\n]) which makes sure it’s at the start of the file or line.