bug#59888: [PATCH] Add 'grep-heading-mode'

[Augusto Stoffel]

On Thu,  8 Dec 2022 at 10:57, Mattias Engdegård wrote:

> No argument about the idea (good to me) or implementation but minor points 
> regarding the regexp:
>
>> +          (group-n 1 (+? any))
>
> Very much prefer `nonl` or `not-newline` to `any`, which is only there for 
> compatibility (shouldn't have been included in the first place).

Hum, not-newline is too long, so this leaves an option between the
slightly deceiving and the quite obscure.

Okay, now I see `any' is not even documented.

>> +          (any "\0-:="))
>
> Is the range (ASCII 00..1A) intended here, or should that be a literal hyphen?
> If the former, it should probably be made more explicit since that
> range includes all sorts of numbers, symbols and control chars and it
> kind of looks like it may be a mistake.

The literal hyphen, which prefixes context lines in `grep -C <n>'.
Thanks for the heads up.