Map usernames from domain\username format to username@domain.com format, C#

Map usernames from domain\username format to username@domain.com format

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            var matcher = new Regex(@"([^\\]+)\\(.+)$");
            var username = @"exprosoft\dag_evry";
            var result = matcher.Match(username);
            
            Console.WriteLine("Captures:");
            foreach(var match in result.Captures){
                Console.WriteLine(match);
            }

Console.WriteLine();
            Console.WriteLine("Groups:");
            foreach(var match in result.Groups){
                Console.WriteLine(match);
            }
            
            Console.WriteLine();
            Console.WriteLine("Mapped result:");
            Console.WriteLine(string.Format("{0}@{1}.com", result.Groups[2], result.Groups[1]));
        }
    }
}


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