using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string str = @"{1:}{2:}{3:}{4:\r\n-}{5:}";

        string regex = @"{4:\r\n-}";

        Match m = Regex.Match(str, Regex.Escape(regex));

        if (m.Success)

        {

            Console.WriteLine("Found '{0}' at position {1}.", m.Value, m.Index);        

        }

        else

        {

            Console.WriteLine("No match found");        

        }

    }

}