Using a simple regex isn't a bad thing. 99.99999999% of my users aren't using a TLD so the regex .+@.+\..{1,63} is great. The problem is that people are naive

Using a simple regex isn't a bad thing. 99.99999999% of my users aren't using a TLD so the regex .+@.+\..{1,63} is great. The problem is that people are naive and write incorrect regexes. Also, don't attribute bad programming to me in your comments when you have no idea what regex I use - that's just rude and belligerent. Emails are trivially easy to check for basic user errors - such as leaving off the TLD or not even providing the domain. Saying otherwise is just being naive again.