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IP address

using System; using System.Text.RegularExpressions; class RXassemblyApp {     static void Main(string[] args) {         string s = "123.45.67.89";         string e =             @"([01]?\d\d?|2[0-4]\d|25[0-5])\." +             @"([01]?\d\d?|2[0-4]\d|25[0-5])\." +             @"([01]?\d\d?|2[0-4]\d|25[0-5])\." +             @"([01]?\d\d?|2[0-4]\d|25[0-5])";         Match m = Regex.Match(s, e);         Console.WriteLine("IP Address: {0}", m);         for (int i = 1; i < m.Groups.Count; i++)             Console.WriteLine(                 "\tGroup{0}={1}", i, m.Groups[i]);     } }