Re: query-replace-regexp: Can't use \0 in TO-STRING

[Eli Zaretskii <eliz@gnu.org>]

> From: zhanghj <netjunegg@gmail.com>
> Date: Sun, 07 May 2017 11:55:15 +0800
> Cc: netjune@qq.com, Emacs developers <emacs-devel@gnu.org>
> 
> Tino Calancha <tino.calancha@gmail.com> writes:
> 
> >> Why not \0? I think \0 is more intuitive and also used in vim.
> > I agree is more intuitive, and it works in `replace-match', or instance:
> > (mapcar
> >  (lambda (group)
> >    (let ((str "foo123"))
> >      (when (string-match "[a-z]+\\([1-9]+\\)" str)
> >        (replace-match "bar" nil nil str group))))
> >  (list 0 1))
> > => ("bar" "foobar")
> >
> > Are you willing to write a patch to implement it?
> 
> The following patch works on my machine for regexp replacing. But I
> don't known if \0 should be supported in other places such as
> sort-regexp-fields, occur.

If this is accepted (and I'm not sure we should), then the user manual
should also be updated, and NEWS should have an entry about the
change.

Thanks.