On 11/22/09 14:58, Jelle Smet wrote:
Hi List,
I'm trying to match lines in python using the re module.
The end goal is to have a regex which enables me to skip lines which have ok
and warning in it.
But for some reason I can't get negative lookaheads working, the way it's explained in
"http://docs.python.org/library/re.html";.
Consider this example:
Python 2.6.4 (r264:75706, Nov 2 2009, 14:38:03)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
import re
line='2009-11-22 12:15:441 lmqkjsfmlqshvquhsudfhqf qlsfh qsduidfhqlsiufh
qlsiuf qldsfhqlsifhqlius dfh warning qlsfj lqshf lqsuhf lqksjfhqisudfh qiusdfhq
iusfh'
re.match('.*(?!warning)',line)
<_sre.SRE_Match object at 0xb75b1598>
I would expect that this would NOT match as it's a negative lookahead and
warning is in the string.
'.*' eats all of line. Now, when at end of line, there is no 'warning' anymore,
so it matches.
What are you trying to achieve?
If you just want to single out lines with 'ok' or warning in it, why not just
if re.search('(ok|warning)') : call_skip
Helmut.
--
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany
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