#19393: Improving email validation

Work Item: 19393

--HG--
branch : 1.x
extra : rebase_source : 314d4929ac0e3ac30953ccb5ee5ed0a3069751f0

src/Orchard.Tests.Modules/Users/Controllers/AccountControllerTests.cs

@@ -204,7 +204,8 @@ namespace Orchard.Tests.Modules.Users.Controllers {
                 @"""Austin@Powers""@example.com",
                 @"Ima.Fool@example.com",
                 @"""Ima.Fool""@example.com",
-                @"""Ima Fool""@example.com"
+                @"""Ima Fool""@example.com",
+                "2xxx1414@i.ua"
                 )]
             string email)
         {

src/Orchard.Web/Modules/Orchard.Users/Models/UserPart.cs

@@ -5,7 +5,7 @@ namespace Orchard.Users.Models {
     public sealed class UserPart : ContentPart<UserPartRecord>, IUser {
         public const string EmailPattern = 
             @"^(?![\.@])(""([^""\r\\]|\\[""\r\\])*""|([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)"
-            + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";
+            + @"@([a-z0-9][\w-]*\.)+[a-z]{2,}$";
 
         public string UserName {
             get { return Record.UserName; }