Reply To: Email verification…oh no, not that!

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a regex that really validates email addresses is quite long, and might not exist anyway.

As shaneisme noted, client-side validation is nothing but a user convenience anyway, so there’s no point in expending too much energy on it. The more fine-grained you make your check, the more likely you are to end up with false negatives, which is bad UX. Even server-side, the only true test of validity is actually sending an email and getting a response back.