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A comment on Is it a must for every programmer to learn regular expressions?. Parent comment

Re:Is it a must for every programmer to learn regular expres... by Auguste on Thursday August 16, 2012 @04:45AM (#4390465)
I find that perfectly readable, except for the \b which I hadn't seen before. It's matching an all-uppercase email address.
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Re:Is it a must for every programmer to learn regular expres... by subsystem on Thursday August 16, 2012 @04:50AM (#4390481)
There's plenty of upper case e-mail addresses that won't match that expression.
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Re:Is it a must for every programmer to learn regular expres... by aidos on Thursday August 16, 2012 @05:08AM (#4390521)
Well, if you want to be fully compliant you can go for this 6kb monster

http://ex-parrot.com/~pdw/Mail-RFC822-Address.html

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Re:Is it a must for every programmer to learn regular expres... by InclinedPlane on Thursday August 16, 2012 @04:52AM (#4390489)
/i
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Re:Is it a must for every programmer to learn regular expres... by subsystem on Thursday August 16, 2012 @05:09AM (#4390523)
There's characters missing[1] and the tld is too short[2]. And even if that's fixed, we still don't match internationalized addresses or actually validate that the e-mail address exists. You're probably better off with something like...

   if "@" in email and "." in email.split("@")[1]:
       send_verification(email)
...but you should probably also check for common misspellings like "gmial.com" etc.

[1] http://en.wikipedia.org/wiki/Email_address#Syntax [2] http://en.wikipedia.org/wiki/List_of_Internet_top-level_doma...

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