limpiar cadena, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            LimpiarCadena("~200|1~");
            LimpiarCadena("~200|12~");
            LimpiarCadena("~200|123~");
            LimpiarCadena("~200|1234~");
            LimpiarCadena("~200|12345~");
            LimpiarCadena("~200|123456~");
            LimpiarCadena("~200|1234567~");
            LimpiarCadena("~200|12345678~");
            LimpiarCadena("~200|123456789~");
        }
        
        private static void LimpiarCadena(string cadena)
        {
            string limpio = Regex.Replace(cadena, @"^~200\|(.*)~$", "$1");
            Console.WriteLine(string.Format("Sucio: '{0}', limpio: '{1}'", cadena, limpio));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,22 sec, cpu time: 0,2 sec, average memory usage: 17 Mb, average nr of threads: 4