Regular Expresion Part : Regular Expression : Regular Expression C# Examples

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Regular Expresion Part








    
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  =  @"(?<part1>[01]?\d\d?|2[0-4]\d|25[0-5])\."  +
                                                  @"(?<part2>[01]?\d\d?|2[0-4]\d|25[0-5])\."  +
                                                  @"(?<part3>[01]?\d\d?|2[0-4]\d|25[0-5])\."  +
                                                  @"(?<part4>[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();
        }
}