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

[Paul Eggert]

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.