using System;
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])";
Regex regex = new Regex( pattern );
Console.WriteLine( "Input given --> {0}",
regex.Replace("192.168.199.1",
"xxx.xxx.xxx.xxx") );
}
}
Input given -- xxx.xxx.xxx.xxx