Subject: Re: bug#58992: 28.2; "lax space matching" no longer works

From: Vincent Lefevre <[email-masked]>
Date: Fri, 4 Nov 2022 11:56:37 +0100

On 2022-11-04 11:41:15 +0100, Vincent Lefevre wrote:
> On 2022-11-04 09:14:57 +0200, Eli Zaretskii wrote:
> > > Date: Fri, 4 Nov 2022 03:29:50 +0100
> > > From: Vincent Lefevre <[email-masked]>
> > > Cc: [email-masked]
> > > 
> > > > Because the newline's syntax is not "whitespace" in those modes.
> > > 
> > > OK, but then, the question is why the newline's syntax is not
> > > "whitespace" in those modes...
> > 
> > Because the mode sets up its syntax tables for various needs, none of
> > which is Isearch.
> 
> But the manual does not discourage the use of syntax classes
> for searching, and it is not clear from the description that
> they won't do what the user expects.

I've searched on the web and found the Emacs wiki

  https://www.emacswiki.org/emacs/RegularExpression

It even encourages the use of "\s-" for searching: this is a page
mainly for searching (see the first line of the text), and in the
"Regexp Syntax Basics" (note: *basics*):

  \sc      character with c syntax (e.g. \s- for whitespace char)

So users are very likely to use it.

-- 
Vincent Lefèvre <[email-masked]> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)