using System;

using System.IO;

using System.Text.RegularExpressions;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Web;

using System.Security.Cryptography;

using System.Text;

using System.Globalization;

using System.ComponentModel.DataAnnotations;

using System.Net.Mail;

​

public class Program

{

    private const string ENCRYPT_KEY = "A4868F33-F599-4F92-ACC5-66CB6E81E0FF";

    public static void Main()

    {

        string str = @"Last, First <name1@domain.com>; spaced name2@domain.com, First Last <name3@domain.com>,""First Last"" <name4@domain.com>, ""Last, First"" <name5@domain.com>; irvin@mail.com, mario, rossi e verdi <pippo@gmail.com>, irvin2@mail.com,rossi&c <pippo2@gmail.com>;pippo3@gmail.com";

​

var strCommaChunks = new List<string>();

strCommaChunks.AddRange(str.Split(',', ';'));

​

var strLowerChunks = new List<string>();

strCommaChunks.ForEach(s => strLowerChunks.AddRange(s.Split('<')));

​

var strUpperChunks = new List<string>();

strLowerChunks.ForEach(s => strUpperChunks.AddRange(s.Split('>')));

​

var validEmails = new List<string>();

strUpperChunks.Where(s => s.Contains('@')).ToList().ForEach(s => validEmails.Add(s.Trim()));

​

validEmails.ForEach(Console.WriteLine);

    }

}