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Regular Expression Question (easy)

Posted on 2004-04-13
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Last Modified: 2010-04-16
I am processing a list of filenames and would like to determine which files do not end in ",v" using regular expressions.

Obviously to find which filenames DO end in ",v" I would use ".*,v$".

How do I negate that?
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Question by:derekl
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Accepted Solution

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Traltixx earned 25 total points
ID: 10830060
well, you can do an if statement to do:

import re

def findV(word):
     if re.search('.*,v$',word) :
          return "v-ed"
    else
          return "not v-ed"


or something hard like:

re.search('.*,[a-u,w-z],word)
or the longer version
re.search('.*,[abcdefghijklmnopqrstuwxyz],word)

note taking into accoutn that it is not case sensitive...hope this helps



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Assisted Solution

by:DEsterkin
DEsterkin earned 25 total points
ID: 10833235
To get the negation in a single expression:

 for f in files:
   if re.search(".*[^(?:,v)]$", f):
     print f

Hope this helps,

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LVL 2

Expert Comment

by:alain_tesio
ID: 10997259
You don't need a regular expression for this, just test fileName.endswith(",v")
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