GNU bug report logs - #68776
bug with escape characters in pattern

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Brendan Richardson <brichardson <at> brandeis.edu>
Subject: bug#68776: closed (Re: bug#68776: bug with escape characters in
 pattern)
Date: Mon, 29 Jan 2024 02:36:02 +0000

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Your bug report

#68776: bug with escape characters in pattern

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 68776 <at> debbugs.gnu.org.

-- 
68776: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=68776
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Brendan Richardson <brichardson <at> brandeis.edu>
Cc: 68776-done <at> debbugs.gnu.org
Subject: Re: bug#68776: bug with escape characters in pattern
Date: Sun, 28 Jan 2024 18:35:35 -0800

On 2024-01-27 16:00, Brendan Richardson wrote:
> If you use input
> egrep "[^\\n\\t]" file
> 
> and the file contains a line with only n or t on it, those lines are also

This is the correct behavior. The command you mention is equivalent to

grep -E '[^nt\]' file

and this outputs all lines containing some character other than 'n', 
't', or '\'. A line containing only n or t should not be output.

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From: Brendan Richardson <brichardson <at> brandeis.edu>
To: bug-grep <at> gnu.org
Subject: bug with escape characters in pattern
Date: Sat, 27 Jan 2024 19:00:37 -0500

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Hello,

If you use input
egrep "[^\\n\\t]" file

and the file contains a line with only n or t on it, those lines are also
excluded
file
normal lines
tttttt
nnnnn



KR
Brendan Richardson

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