MatchEvaluator: Entry Point IP Reverse

   


using System;
using System.Text;
using System.Text.RegularExpressions;

public class EntryPoint
{
    static void Main( string[] args ) {

        // Create regex to search for IP address pattern.
        string pattern = @"(?<part1>[01]?dd?|2[0-4]d|25[0-5])." +
                         @"(?<part2>[01]?dd?|2[0-4]d|25[0-5])." +
                         @"(?<part3>[01]?dd?|2[0-4]d|25[0-5])." +
                         @"(?<part4>[01]?dd?|2[0-4]d|25[0-5])";
        Regex regex = new Regex( pattern );
        Match match = regex.Match( "192.168.169.1" );

        MatchEvaluator eval = new MatchEvaluator(EntryPoint.IPReverse );
        Console.WriteLine( regex.Replace("192.168.169.1", eval) );
    }

    static string IPReverse( Match match ) {
        Console.WriteLine( match.Groups["part4"] + "." );
        Console.WriteLine( match.Groups["part3"] + "." );
        Console.WriteLine( match.Groups["part2"] + "." );
        Console.WriteLine( match.Groups["part1"] );
        return "";
    }
}