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    <p>Oh my God. People! I hate Net.Mail. Regex are best of the best.</p> <p>Take a look at this code and you'll see that I'm right.</p> <pre><code>public const string Email4 = @"^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&amp;'\*\+/=\?\^`\{\}\|~\w])*)(?&lt;=[0-9a-zA-Z])@))(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$"; private static Regex regex; private static void Main(string[] args) { var regex = new Regex(Email4, RegexOptions.Compiled); var list = new List&lt;string&gt;(); var str = new[] { // Success email "mkyong@yahoo.com", "mkyong-100@yahoo.com", "mkyong.100@yahoo.com", "mkyong111@mkyong.com", "mkyong-100@mkyong.net", "mkyong.100@mkyong.com.au", "mkyong@1.com", "mkyong@gmail.com.com", "mkyong+100@gmail.com", "mkyong-100@yahoo-test.com", //Fail email "mkyong", "mkyong@.com.my", "mkyong123@gmail.a", "mkyong123@.com", "mkyong123@.com.com", ".mkyong@mkyong.com", "mkyong()*@gmail.com", "mkyong@%*.com", "mkyong..2002@gmail.com", "mkyong.@gmail.com", "mkyong@mkyong@gmail.com", "mkyong@gmail.com.1a", // Test Email project "mkyong@gmail.com", // success "mkyong_sdf@gmail.com", // success "mkyong_@gmail.com", // fail // success "test+test@gmail.com" }; list = str.ToList(); foreach (string x in list) { foreach (string st in ParseEmail(x)) { Console.WriteLine(st); } } Console.ReadKey(); } private static IEnumerable&lt;string&gt; ParseEmail(string str) { regex = new Regex(email_pattern, RegexOptions.Compiled); return regex.Matches(str).Count &gt; 0 ? (from x in regex.Matches(str).Cast&lt;Match&gt;() select (x.Value + "\t\t True\t" + Validate(str))) : new[] {str + "\t\t False\t"+Validate(str)}; } private static bool Validate(string email) { try { var address = new MailAddress(email); if (address.Address == email || address.Address.Equals(email)) return true; else return false; } catch (Exception exception) { return false; } } </code></pre> <p><em>> plzz..dont use regex..this is like cutting a tree with hammer – Fake.It.Til.U.Make.It</em></p> <p><strong>Now, all together on the pattern and take a look at the library. It turns out that Net.Mail missing even worse mistake than the pattern regex.</strong></p> <p>If someone is confronted with such a situation and will not need anything else, here I wrote myself.</p> <pre><code>@"^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9_]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$"; </code></pre> <p>For those who looking for a different solution <a href="http://fightingforalostcause.net/misc/2006/compare-email-regex.php" rel="nofollow">Email Regex compare</a></p>
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