GNU bug report logs - #75806
Trailing spaces; pattern "\s" before "[[:cntrl:]]" faulty

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Message #19 received at 75806-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Andreas BROCKMANN <andreas.brockmann <at> diehl.com>
Cc: "cygwin <at> cygwin.com" <cygwin <at> cygwin.com>, 75806-done <at> debbugs.gnu.org
Subject: Re: bug#75806: Trailing spaces; pattern "\s" before "[[:cntrl:]]"
 faulty
Date: Sat, 25 Jan 2025 11:31:06 -0800

On 2025-01-24 05:27, Andreas BROCKMANN via Bug reports for GNU grep wrote:
> The 1st command below correctly reports trailing spaces, for Unix and Windows format files.
> The 2nd one incorrectly reports all lines.
> 
>    grep -sHn -i " [[:cntrl:]]*$" *.vhd
>    grep -sHn -i "\s[[:cntrl:]]*$" *.vhd

I don't see a bug. The latter command is equivalent to:

   grep -Hins '[[:space:]][[:cntrl:]]*$' *.vhd

and if the input files use Microsoft CRLF format then [[:space:]] 
matches the CR at the end of every line and [[:cntrl:]]* matches the 
empty string after the CR.

Possibly you need to use Unix LF format, or use the --text option, or 
something like that.

Marking the bug as done.

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