using System;

public class Program

{

    public static void Main()

    {

        string invalidChars = String.Format("[{0}]", System.Text.RegularExpressions.Regex.Escape(new string(System.IO.Path.GetInvalidFileNameChars())));

        string str = "something_)%#%:cool.pcap";

        Console.WriteLine(invalidChars);

        Console.WriteLine(str);

        Console.WriteLine(System.Text.RegularExpressions.Regex.Replace(str, invalidChars, string.Empty));

    }

}