@"^(?("")("".+?(?<!\)""@)|((0-9a-z)(?<=[0-9a-z])@))(?([)([(\d{1,3}.){3}\d{1,3}])|(([0-9a-z][-\w][0-9a-z]*.)+[a-z0-9][-a-z0-9]{0,22}[a-z0-9]))$"
!Regex.IsMatch(UserEmail, @"^(?("")("".+?(?<!\)""@)|((0-9a-z)(?<=[0-9a-z])@))" + @"(?([)([(\d{1,3}.){3}\d{1,3}])|(([0-9a-z][-\w][0-9a-z]*.)+[a-z0-9][-a-z0-9]{0,22}[a-z0-9]))$", RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250)
#Phone number
simple version
^[0-9]+$