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Asked: 2026-06-07T00:12:18+00:00

I use python 2.7. I have data in file ‘a’: myname1@abc.com;description1 myname2@abc.org;description2 myname3@this_is_ok.ok;description3 myname5@qwe.in;description4

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I use python 2.7.
I have data in file ‘a’:

myname1@abc.com;description1
myname2@abc.org;description2
myname3@this_is_ok.ok;description3
myname5@qwe.in;description4
myname4@qwe.org;description5
abc@ok.ok;description7

I read this file like:

with open('a', 'r') as f:
    data = [x.strip() for x in f.readlines()]

i have a list named bad:

bad = ['abc', 'qwe'] # could be more than 20 elements

Now i’m trying to remove all lines with ‘abc’ and ‘qwe’ after @ and write the rest to the newfile.
So in newfile should be only 2 lines:

myname3@this_is_ok.ok;description3
abc@ok.ok;description7

I’ve been tryin to use regexp (.?)@(.?);(.*) to get groups, but i don’t know what to do next.

Advice me, please!

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1 Answer

  1. Editorial Team
    import re
bad = ['abc', 'qwe']

with open('a') as f:
    print [line.strip() 
           for line in f
           if not re.search('|'.join(bad), line.partition('@')[2]]

    This solution works as long as bad only contains normal characters eg. letters, numbers, underscores but nothing that interferes with the regex expression like 'a|b' as @phihag pointed out.

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