using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
      string s = "W\"oo\\lworth's";
      string pattern = "(['^$.|?*+()\\\\])";
      string replacement = "\\$1";
      
      Regex rgx = new Regex(pattern);
      string t = rgx.Replace(s, replacement);

      Console.WriteLine("Original String: {0}", s);
      Console.WriteLine("Replacement String: {0}", t);  
	}
}