Re: What is wrong with this regex for matching emails?

[Ned Batchelder]

On 12/17/17 10:29 AM, Peng Yu wrote:
Hi,
I would like to extract "a...@efg.hij.xyz". But it only shows ".hij".
Does anybody see what is wrong with it? Thanks.

$ cat main.py
#!/usr/bin/env python
# vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8:

import re
email_regex = re.compile('[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)')
s = 'a...@efg.hij.xyz.'
for email in re.findall(email_regex, s):
     print email

$ ./main.py
.hij


There are two problems: you have a group at the end to match .something, 
but you need to make that 1-or-more of those, with a +. Second, 
re.findall will only return the matched groups, so you need to change 
your final group to be a non-capturing group, with (?:...)

    email_regex = 
re.compile('[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+')

--Ned.
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