Re: [PATCH v4] emacs: customizable names for search buffers

Subject: Re: [PATCH v4] emacs: customizable names for search buffers

Date: Thu, 13 Jan 2022 22:43:36 +0000

To: Tomi Ollila,


From: Jose A Ortega Ruiz

On Thu, Jan 13 2022, Tomi Ollila wrote:


> I am curious about this regexp, \b is matching word/non-word boundary -- so
> I had to test it.
> (replace-regexp-in-string "\\b%t\\b" "repl" "foo %t bar") ;; no replacement
> (replace-regexp-in-string "\\b%t\\b" "repl" "foo-%t-bar") ;; no replacement
> ...
> (replace-regexp-in-string "\\b%t\\b" "repl" "foox%t-bar") ;; replacement!
> before % there is "word" character and after t there is "non-word" character.

Ah, yes... i messed up, i think we want here

   (replace-regexp-in-string "\\_<%t\\_>" "repl" "foo %t bar")

i.e. \_< .. \_> to correctly delimit beginning and end of word, not just
boundary (i always trip on this!).

> Also tried (format-spec "foo-%t-bar" '((?t . "repl"))) ;; which works as
> I'd expect.

yeah, that's what i use and didn't notice my error above.  format-spec
is much nicer than a plain regexp subs, one can use format specifiers
like %3t and many others, but unfortunately seems to have been
introduced in emacs 27.

thanks for checking, and if you can confirm the above fix looks better,
i'll submit a new version.

A language that doesn't affect the way you think about programming, is
not worth knowing.
  - Alan Perlis, Epigrams on Programming
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