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Create regex to search for IP address pattern 2

using System; using System.Text.RegularExpressions; public class MainClass {     static void Main( string[] args ) {         string pattern = @"([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])";         Regex regex = new Regex( pattern );         Match match = regex.Match( "192.168.1.168" );         while( match.Success ) {             Console.WriteLine( "IP Address found at {0} with " +                                "value of {1}",                                match.Index,                                match.Value );             match = match.NextMatch();         }              } } IP Address found at 0 with value of 192.168.1.168