Find parameters and type with RegEx

Question

I am reading out .cs-files and want to store all parameters per method with at least two parameters. So every two word-combination between paranthesses like follows:

public static void MyFunction(string Param1, int Param2, List<string> Param3)

It should extract string Param1, int Param2 and List<string> Param3 into a collection. There is always a minimum of two parameters when using this.

So far I got the following Regex:

([A-Za-z0-9<>]+\s[a-z0-9]+)

This scans over the entire method header so includes public static as a match too.

Any suggestions on how to fix this?

Thanks.

In your application, compile the code from the .cs files and then use reflection to extract the necessary information. The compilation step would also serve as a check whether the code in question is proper C#. See [here](http://stackoverflow.com/questions/7944036/compile-c-sharp-code-in-the-application) or [here](http://stackoverflow.com/questions/826398/is-it-possible-to-dynamically-compile-and-execute-c-sharp-code-fragments) for further information... — , Jun 20 '15 at 14:19
Why are you using regex for this? Parsing code is a solved problem, you don't need to solve it again. You should use [Roslyn](https://github.com/dotnet/roslyn) for this. — Thomas Levesque, Jun 20 '15 at 14:47
Because there is no need or way to compile this. These are .cs files from multiple projects that are not related in any way. — Roel, Jun 20 '15 at 14:49

score 1 · Accepted Answer · answered Jun 20 '15 at 17:02

This just seems much easier to do without using Regex. You'll obviously need something to identify the function header, but once you know you have a function header just break out the parameters like this:

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        string functionHeader = "public static void MyFunction(string Param1, int Param2, List<string> Param3)";
        string parameters = functionHeader.Substring(functionHeader.IndexOf("(") + 1)
                                          .Replace(", ", ",")
                                          .Replace(")", String.Empty);

        List<string> parametersCollection = new List<string>(parameters.Split(','));
        parametersCollection.ForEach(pc => Console.WriteLine(pc));
    }
}

Results:

string Param1
int Param2
List<string> Param3

Find parameters and type with RegEx

1 Answers1