URL:
<http://savannah.gnu.org/bugs/?24903>
Summary: grep multiple items is really slow
Project: grep
Submitted by: dkremer_me
Submitted on: sam 22 nov 2008 19:31:12 GMT
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
Hello. I have noticed that performing a search with multiple items
(expression made of OR logical operators) is very slow.
grep '\(something\|another\|else\|what\|you\|want\)' my_large_file is really,
really, and incredibly slow.
When a normal pattern research takes 40 minutes on my file, this takes more
than four hours (and more).
So, I think it's a big performance problem, and should be resolved, but I
don't know exactly why this happens. I will take a look in the source code
maybe.
See you later.
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