On Tue, Jun 28, 2022 at 11:29:51AM +0200, Daniel Martín wrote:

[...]

> You can pass the universal argument to occur to only show the matches
> for the regexp, excluding the rest of the line.  For example:
> 
> C-u C-s REGEXP C-u M-s o
> 
> This will show an *Occur* buffer with only the matching parts of REGEXP
> in the current buffer, which you can save to a file, etc.

Woah. I didn't know that one, thanks. This seems to come close
to the OP's wishes, yes.

Cheers
-- 
t