Python RSS Python RSS

Regex for re.match not working as expected.

Reply

•
•
Join Date: Oct 2008
Posts: 2
Reputation: unkwntech is an unknown quantity at this point 
Solved Threads: 0
unkwntech unkwntech is offline Offline
Newbie Poster

Regex for re.match not working as expected.

 
0
  #1
Oct 9th, 2008
I have the following code:
python Syntax (Toggle Plain Text) 
  1. import re
  2. string = 'c:\test.doc'
  3. if re.match(r":\\[0-9a-z]", string):
  4.       ##r":\\[0-9a-z]" should match ':\t'
  5.       print 'true'
  6. else:
  7.       print 'false'
the problem I am having is that this is always evaluating to false.
Reply With Quote Quick reply to this message  
•
•
Join Date: Mar 2007
Posts: 110
Reputation: solsteel is on a distinguished road 
Solved Threads: 31
solsteel solsteel is offline Offline
Junior Poster

Re: Regex for re.match not working as expected.

 
0
  #2
Oct 9th, 2008
The substring "\t" in string is evaluated as a tab character. The re method match only matches at the beginning of a string. Try this:
Python Syntax (Toggle Plain Text) 
  1. import re
  2. s = r'c:\test.doc'
  3. m = re.search(r":(\\[0-9a-z])", s)
  4. if m:
  5.       print m.group(1)
  6. else:
  7.       print m
Reply With Quote Quick reply to this message  
•
•
Join Date: Oct 2008
Posts: 2
Reputation: unkwntech is an unknown quantity at this point 
Solved Threads: 0
unkwntech unkwntech is offline Offline
Newbie Poster

Re: Regex for re.match not working as expected.

 
0
  #3
Oct 9th, 2008
Ok, I'm not used to that yet, in PHP if I encased the string in ' it would have not evaluated the \t, or any other special character.

Thanks.
Reply With Quote Quick reply to this message  
•
•
Join Date: Jul 2008
Posts: 1,041
Reputation: jlm699 is a jewel in the rough jlm699 is a jewel in the rough jlm699 is a jewel in the rough jlm699 is a jewel in the rough 
Solved Threads: 261
Sponsor
jlm699's Avatar
jlm699 jlm699 is offline Offline
Knows where his Towel is

Re: Regex for re.match not working as expected.

 
0
  #4
Oct 10th, 2008
you could just as easily do s = 'c:\\test.doc'
1. Use Code Tags.
2. Homework? Show Effort.
3. Keep discussions on the forum: no PMs
Reply With Quote Quick reply to this message  
•
•
Join Date: Mar 2007
Posts: 110
Reputation: solsteel is on a distinguished road 
Solved Threads: 31
solsteel solsteel is offline Offline
Junior Poster

Re: Regex for re.match not working as expected.

 
0
  #5
Oct 10th, 2008
If the file name is a variable returned from some source:
Python Syntax (Toggle Plain Text) 
  1. >>> s = "c:\test.doc"
  2. >>> s1 = repr(s).strip("'")
  3. >>> s1
  4. 'c:\\test.doc'
  5. >>>
Reply With Quote Quick reply to this message  
Reply

Quick Reply to Thread
This thread is more than three months old.
Perhaps start a new thread instead?
•
•
•
•
•
•
•
•
Message:
•
•
•
•



Other Threads in the Python Forum
Thread Tools Search this Thread



alarm anydbm app beginner cipher cmd conversion coordinates corners curves cx-freeze data decimals definedlines development dictionary directory dynamic error excel feet file float format function generator getvalue halp handling homework http import input ip itunes keycontrol leftmouse line linux list lists loan loop maintain maze millimeter module mouse number numbers output parsing path prime programming push py2exe pygame pymailer python queue random rational raw_input recursion recursive schedule screensaverloopinactive script scrolledtext searchingfile slicenotation split sqlite ssh string strings sudokusolver text threading time tlapse tooltip tuple tutorial type ubuntu unicode url urllib urllib2 variable variables ventrilo vigenere web webservice wikipedia wxpython xlwt
About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC