Re^3: Pimp My RegEx

Yes, but as originally written your regex would miss the last log entry, because it fails the positive lookahead assertion.

In fact, with the example you supplied, the output is

Parsed 10 log file entries in 0.0013 seconds, averaging 0.0001
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while in reality there are 11 entries:

% perl -lne 'print substr($_, 0, 30) if /^2004/' 462148.pl
2004-01-05 22:37:48:879 : xscW
2004-01-05 22:38:52:019 : xscW
2004-01-05 22:43:02:239 : xscW
2004-02-05 22:37:48:879 : xscW
2004-02-05 22:38:52:019 : xscW
2004-02-05 22:43:02:239 : xscW
2004-02-05 22:43:50:769 : xscW
2004-02-05 22:44:51:979 : xscW
2004-02-05 22:47:12:879 : xscW
2004-02-05 22:49:50:059 : xscW
2004-02-05 22:49:50:079 : xscW
% perl -lne 'print substr($_, 0, 30) if /^2004/' 462148.pl | wc
     11      44     341
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Regarding the payload, please see the update to my original reply.

Update: Added further comments on the error in the original regex.

the lowliest monk

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Re^4: Pimp My RegEx by heathen (Acolyte) on May 31, 2005 at 20:19 UTC
as originally written your regex would miss the last log entry, because it fails the positive lookahead assertion You are correct - definately an unintended consequence. Since a log file entry could span multiple lines I was using the lookahead to in effect say "stop capturing when you can see the next log file entry" The sample data I included in the original script probably should have included some of the more complex, multi-line log file entries.	[reply]

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Re^4: Pimp My RegEx
by heathen (Acolyte) on May 31, 2005 at 20:19 UTC

as originally written your regex would miss the last log entry, because it fails the positive lookahead assertion

You are correct - definately an unintended consequence. Since a log file entry could span multiple lines I was using the lookahead to in effect say "stop capturing when you can see the next log file entry"
The sample data I included in the original script probably should have included some of the more complex, multi-line log file entries.

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