using System;
using System.Text.RegularExpressions;
					
public class Program
{
	public static void Main()
	{
		string text = @"It is @google.com or @google w@google \@google \\@google";
  		string result = SafeReplace(text,"@google", "some domain", true);
		Console.WriteLine(result);
	}
	
	
	public static string SafeReplace(string input, string find, string replace, bool matchWholeWord)
    {
        string textToFind = matchWholeWord ? string.Format(@"(?<!\S){0}(?!\S)", Regex.Escape(find)) : find;
        return Regex.Replace(input, textToFind, replace.Replace("$","$$"));
    }
}