I would like some help on how to do a pseudocode for checking the formatting of an email is correct. I am using Python but need to plan it out first
Generic Rules: 1. alphnumeric before @ 2. @ 3. Alphnumeric after @ 4. . (dot) after @
Thank you
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Possible duplicate of [How to check whether a given email address exists or not in python](http://stackoverflow.com/questions/13625672/how-to-check-whether-a-given-email-address-exists-or-not-in-python) – Marcus Müller Jan 28 '16 at 13:04
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You are missing characters such as `-_.+` etc. E-mail validation that really works 99.99% is very painful. You should take a look at http://emailregex.com/ and http://www.ietf.org/rfc/rfc5322.txt – Arnaud Denoyelle Jan 28 '16 at 13:07
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Possible duplicate of [Python check for valid email address?](http://stackoverflow.com/questions/8022530/python-check-for-valid-email-address) – Thilo Jan 28 '16 at 13:07
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@ArnaudDenoyelle: And 99.99% is not so great if you have 10M users. – Thilo Jan 28 '16 at 13:08