Solved

Regular Expression Question (easy)

Posted on 2004-04-13
5
227 Views
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?
0
Comment
Question by:derekl
5 Comments
 
LVL 2

Accepted Solution

by:
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



0
 

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,

0
 
LVL 2

Expert Comment

by:alain_tesio
ID: 10997259
You don't need a regular expression for this, just test fileName.endswith(",v")
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Plenty of writing has gone on the web trying to compare Python with other competitive programming languages and vice versa. However, not much has been put into a wholistic perspective. This article should help you decide whether to adopt Python as a…
Dictionaries contain key:value pairs. Which means a collection of tuples with an attribute name and an assigned value to it. The semicolon present in between each key and values and attribute with values are delimited with a comma.  In python we can…
Learn the basics of if, else, and elif statements in Python 2.7. Use "if" statements to test a specified condition.: The structure of an if statement is as follows: (CODE) Use "else" statements to allow the execution of an alternative, if the …
Learn the basics of while and for loops in Python.  while loops are used for testing while, or until, a condition is met: The structure of a while loop is as follows:     while <condition>:         do something         repeate: The break statement m…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now