using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string input = "This {is} a {test}...";

        string output = Test(input);

        Console.WriteLine(output);

    }

​

    public static string Test(string input)

    {

        var inItems=Regex.Match("inBerlin".ToLowerInvariant(),"in");

        string output = Regex.Replace("in(Berlin","in(","");

        return output;

    }

}