this post was submitted on 12 Feb 2026
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Yep. This happens when some idiot tries to roll their own regex. I've also seen them frequently reject my+email@domain
My favorite is when you do “first.last+company@domain.com” and they come back saying it’s an invalid email. But “first.last+somethingelse@domain.com” works just fine. Meaning they are looking for their company name in the email and hard failing on it.
The one I am thinking of in particular also failed with “company@domain.com”.
Email address regex: '.+.+'
Joke, here's some reading on it. Basically, E-Mail address can have almost any form and you better use a library that doesn't use regexp parsing.