using System;
using System.Text;
using System.Text.RegularExpressions;
public class MainClass
{
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( "192.1.1.122" );
MatchEvaluator eval = new MatchEvaluator(IPReverse );
Console.WriteLine( regex.Replace("192.1.1.122", eval) );
}
static string IPReverse( Match match ) {
StringBuilder sb = new StringBuilder();
sb.Append( match.Groups["part4"] + "." );
sb.Append( match.Groups["part3"] + "." );
sb.Append( match.Groups["part2"] + "." );
sb.Append( match.Groups["part1"] );
return sb.ToString();
}
}
122.1.1.192