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devel / comp.lang.python / Re: Checking if email is valid

Re: Checking if email is valid

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From: grant.b.edwards@gmail.com (Grant Edwards)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
Date: Wed, 01 Nov 2023 14:50:43 -0700 (PDT)
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by: Grant Edwards - Wed, 1 Nov 2023 21:50 UTC

On 2023-11-01, Chris Angelico via Python-list <python-list@python.org> wrote:
> On Thu, 2 Nov 2023 at 08:09, Grant Edwards via Python-list
><python-list@python.org> wrote:

>> Make sure it has an '@' in it. Possibly require at least one '.'
>> after the '@'.
>
> No guarantee that there'll be a dot after the at.

Ah, I forgot about defaulting to a local domain if one is
omitted. Will MTAs do that these days?

> (Technically there's no guarantee of an at sign either, but email
> addresses without at signs are local-only, so in many contexts, you
> can assume there needs to be an at.)
>
> So the regex to match all valid email addresses that aren't
> local-only is... drumroll please...
>
> r"@"

Unless you want to support UUCP or X400 addresses...

Subject	Author
Re: Checking if email is valid	Grant Edwards