From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: :alnum: broken?
Date: Sat, 22 Feb 2020 09:48:02 +0200
Message-ID: <8336b3jc5p.fsf@gnu.org>
References: <86wo8flqct.fsf@stephe-leake.org>
 <f89e340f-9a19-50e1-4421-57fd3e235548@cs.ucla.edu>
 <86sgj3ljf0.fsf@stephe-leake.org>
 <5fecc0e1-1ee2-5a89-9297-b0b9aa4a8e9c@cs.ucla.edu>
Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202";
	logging-data="17222"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: stephen_leake@stephe-leake.org, emacs-devel@gnu.org
To: Paul Eggert <eggert@cs.ucla.edu>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Feb 22 08:48:46 2020
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1j5PWn-0004OK-Vr
	for ged-emacs-devel@m.gmane-mx.org; Sat, 22 Feb 2020 08:48:45 +0100
Original-Received: from localhost ([::1]:39776 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1j5PWn-0007s1-2a
	for ged-emacs-devel@m.gmane-mx.org; Sat, 22 Feb 2020 02:48:45 -0500
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53973)
 by lists.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>) id 1j5PWG-0007QR-1R
 for emacs-devel@gnu.org; Sat, 22 Feb 2020 02:48:13 -0500
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:49926)
 by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@gnu.org>)
 id 1j5PWE-0004xa-BR; Sat, 22 Feb 2020 02:48:10 -0500
Original-Received: from [176.228.60.248] (port=1776 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256)
 (Exim 4.82) (envelope-from <eliz@gnu.org>)
 id 1j5PWD-0005gd-R7; Sat, 22 Feb 2020 02:48:10 -0500
In-reply-to: <5fecc0e1-1ee2-5a89-9297-b0b9aa4a8e9c@cs.ucla.edu> (message from
 Paul Eggert on Fri, 21 Feb 2020 17:09:20 -0800)
X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:245027
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/245027>

> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Fri, 21 Feb 2020 17:09:20 -0800
> 
> Perhaps better yet would be for Emacs to do what GNU grep does:
> 
> $ grep '[:space:]'
> grep: character class syntax is [[:space:]], not [:space:]
> $ echo $?
> 2

But "[:space:]" is a valid, though peculiar, character class, so
erroring out for it would be inappropriate, IMO.