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

namespace TestEmail2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter your email address: ");
            string emailAddress = Console.ReadLine();
            if (IsEmailValid(emailAddress))  { Console.WriteLine("Valid email"); }
            else {Console.WriteLine(emailAddress + " is not a valid email address.");}
            Console.WriteLine("Press any key to exit");
            Console.ReadKey();
        }

        /* Sourced from http://www.tipsntracks.com/117/validate-an-email-address-using-regular-expressions.html */
        public static bool IsEmailValid(string emailAddress)
        {
            Regex myRegex = new Regex("\b[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]{2,4}\b");
            bool isValid = false;
            if (string.IsNullOrEmpty(emailAddress))
            {
                isValid = false;
            }
            else
            {
                isValid = myRegex.IsMatch(emailAddress);
            }

            return isValid;
        }
    }


}
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<div class="signature">Jon</div>