[esperent]

The best you can hope to do is reduce a small class out of possible errors. But you'll never get a test that can prevent errors like [e-mail], [e-mail], [e-mail] etc. So is it really worth doing any checks at all?

I have a .blue email address and it's amazing how many sites still won't accept it. I keep a spare Gmail account for these.

[thedufer]

> But you'll never get a test that can prevent errors like [e-mail], [e-mail], [e-mail] etc. So is it really worth doing any checks at all?

You can do quite well at this, if you're willing to not restrict yourself to regexes and commit to some amount of hackery. One system I worked on used a simple regex (just what is described here IIRC - assert the existence of an @ sign), plus did an MX check on the domain, plus warned (not errored) if the domain was within 1 or 2 Levenshtein distance of any of a list of most common email domains (yahoo, gmail, etc). Statistically it seems like we saved people a lot of grief with this simple filtering.

[arp242]

> So is it really worth doing any checks at all?

People accidentally typing their name in the email field, stuff like that. I've done that.

The problems with your .blue is obviously completely unrelated to the "email.contains('@')" check the poster is doing.

[90s_dev]

I resent being called a poster! I am not flat, nothing was ever printed on me. I am a human being, you.. you... you piece of sheet!

[90s_dev]

The downvotes are a sign that I did not notice that my reply to the poster was not composed. I got the memo, and will take note from now on, mark my words!

[qingcharles]

.blue is 11 years old and still has issues. Same with several of the gtlds I have. I had an argument with a major backend email provider recently who refused to open an account for me as my gtld wasn't "valid." (they backed down eventually and fixed their code)

I keep a Gmail for the same reason.

I tried to add a .wiki link to a Reddit profile recently and their filters also say that domain is invalid.

[jjani]

> I tried to add a .wiki link to a Reddit profile recently and their filters also say that domain is invalid.

That's absurd, there's a .wiki that's almost definitely in the top 20 most visited websites in Korea, if not higher.

[HeliumHydride]

There's also minecraft.wiki.

[90s_dev]

In other words, /^.+?@.+$/ is a user-friendly reminder that you forgot the @ sign or something. That's all.