Get Group in a match : Regex Group « Regular Expression « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Regular Expression
3. Regex Group

using System;
using System.Text.RegularExpressions;

public class EntryPoint
{
    static void Main( string[] args ) {
        // Create regex to search for IP address pattern.
        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])\." +
                         @"([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:" );
            foreach( Group g in match.Groups ) {
                Console.WriteLine( "\t{0} at {1}",
                                   g.Value,
                                   g.Index );
            }

            match = match.NextMatch();
        }
        
    }
}

IP Address found at 0 with value of 192.168.169.1
Groups are:
        192.168.169.1 at 0
        192 at 0
        168 at 4
        169 at 8
        1 at 12