Email Regex that DOES include unicode domains

Question

I was wondering if anybody has found a solution that validates an email that includes unicode characters as in from a unicode domain? I have searched at length and have yet to find a solution that works.

Answer 1

Fully validating an email address through a regex is hard. Really hard. This is one that is fully compliant with RFC822. Even if you create a perfect regex that correct validates all email addresses, that doesn't stop me from entering [email protected] (If you're trying to make sure that I enter a valid email address) or from accidentally misspelling my username (If you're trying to make sure that I enter my email address correctly).

Just send a link in an email saying, "click here to validate your email address."