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Match Groups

using System; using System.Text.RegularExpressions; public class EntryPoint {     static void Main( string[] args ) {         // Create regex to search for IP address pattern.         string pattern = @"(?<part1>[01]?\d\d?|2[0-4]\d|25[0-5])\." +                          @"(?<part2>[01]?\d\d?|2[0-4]\d|25[0-5])\." +                          @"(?<part3>[01]?\d\d?|2[0-4]\d|25[0-5])\." +                          @"(?<part4>[01]?\d\d?|2[0-4]\d|25[0-5])";         Regex regex = new Regex( pattern );         Match match = regex.Match( "192.168.169.1" );         while( match.Success ) {             Console.WriteLine( "IP Address found at {0} with " +                                "value of {1}",                                match.Index,                                match.Value );             Console.WriteLine( "Groups are:" );             Console.WriteLine( "\tPart 1: {0}",                                match.Groups["part1"] );             Console.WriteLine( "\tPart 2: {0}",                                match.Groups["part2"] );             Console.WriteLine( "\tPart 3: {0}",                                match.Groups["part3"] );             Console.WriteLine( "\tPart 4: {0}",                                match.Groups["part4"] );             match = match.NextMatch();         }              } }