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bug#31796: 27.1; dired-do-find-regexp-and-replace fails to find multilin

From: Drew Adams
Subject: bug#31796: 27.1; dired-do-find-regexp-and-replace fails to find multiline regexps
Date: Mon, 23 Nov 2020 08:16:26 -0800 (PST)

> The dired-do-find-regexp-and-replace command does not seem
> to parse the regex entered by the user correctly.  If the
> regex string contains a newline character (^Q^J), it seems
> that the parsing stops there.  At least I have seen errors
> like "unmatched bracket" and the like.
> Anyhow, I did not get it to replace multiline text.
> I found an answer here:
> https://emacs.stackexchange.com/questions/30437/dired-search-and-replace-is-throwing-no-results
> The solution is to manually invoke
> dired-do-query-replace-regexp (instead of pressing just Q).
> However, this solution is hard to discover, because it is
> unexpected that the official regex-replace feature (key Q)
> contains such a blunder.
> - Why isn't the more robust dired-do-query-replace-regexp
>   bound to Q?

It _was_ bound to `Q' - for decades.  But the inventor
of `dired-do-find-regexp-and-replace' decided to give
that binding to his command.  (I argued in vain in
favor of giving the new command a different binding,
keeping `Q' as it was.  Similarly for `A'.)

> - Why not fix the bug in dired-do-find-regexp-and-replace?
> It has been reported for version 26 already, and it is not
> a minor issue. Replacing interactively in several files is
> an **extremely** useful feature, and I would not want to
> do something like that outside of emacs.



FWIW, Dired+ binds `dired-do-query-replace-regexp'
to `M-q' (respecting the new binding of `Q' to
`dired-do-find-regexp-and-replace', though I
disagree with it).  And Dired+ has both commands
on the menus:

 Multiple > Search >
   Query Replace Using TAGS Table...   M-q
   Query Replace Using `find'...       Q


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