将多个空格换成一个空格(正则表达式)

using System;
using System.Text.RegularExpressions;
public class Example
{
    public static void Main()
    {
        try
        {
            string input = "This is   text with   far  too   much   " + "whitespace.";
            string pattern = "\\s+";
            string replacement = " ";
            Regex rgx = new Regex(pattern);
            string result = rgx.Replace(input, replacement);
            Console.WriteLine("Original String: {0}", input);
            Console.WriteLine("Replacement String: {0}", result);
            Console.Read();
        }
        catch (Exception)
        {

            throw;
        }
    }
}