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what debugging regex feels like (lemmy.ml)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 85 points 1 month ago* (last edited 1 month ago) (15 children)

I found your email address:

(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

[–] [email protected] 17 points 1 month ago (10 children)

I was about to ruin your day by finding a valid email address that would be rejected by your regex, but it doesn't even parse correctly on regex101.com

The only valid regex for email is .+@.+ btw

[–] [email protected] 5 points 1 month ago (1 children)

What about "user@not_domain"? It validates but isn't valid - there's no domain part, the @ is quoted

[–] [email protected] 4 points 1 month ago

That's not something you can determine using a regex.

"user@com" for example could be a perfectly working email.

The right way is to send a verification email in every case.

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