using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        const string input = "*fName  *   -sName!lName(London) ";

​

        var replacePunctuation = Regex.Replace(input,

            @"[^\w()]+", " ");

​

        var replaceBrackets = Regex.Replace(replacePunctuation,

            @"\((?'brackets'[^)]+)\)", match => $",{match.Groups["brackets"].Value},");

​

        Console.WriteLine(replaceBrackets);

    }

}