GNU bug report logs - #40634
Massive pattern list handling with -E format seems very slow since 2.28.

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Package: grep;

Reported by: fryasu <at> yahoo.co.jp

Date: Wed, 15 Apr 2020 02:21:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #17 received at 40634 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Norihiro Tanaka <noritnk <at> kcn.ne.jp>
Cc: fryasu <at> yahoo.co.jp, 40634 <at> debbugs.gnu.org
Subject: Re: bug#40634: Massive pattern list handling with -E format seems
 very slow since 2.28.
Date: Thu, 16 Apr 2020 16:00:29 -0700

On 4/16/20 3:53 PM, Norihiro Tanaka wrote:

> I have had no idea to solve the problem yet.  If we revert it, bug#33357
> will come back.

Yes, I'd rather not revert if we can help it.

My own thought was to not analyze the regular expression if we discover that the 
input is empty. :-)
This bug report was last modified 4 years and 328 days ago.

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