From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Ugly regexps
Date: Wed, 03 Mar 2021 08:19:34 +0200
Message-ID: <83mtvk69op.fsf@gnu.org>
References: <jwvk0qpjd31.fsf-monnier+emacs@gnu.org>
 <CADwFkm=8qfh1RQkK6qbvEt=-Ch_vXKCe5NvJ_L_OVXsnf=DpZg@mail.gmail.com>
 <CADwFkmnAa6rgwi-y=0b-BSQ4hqPt4cd8ED_Ks+Ek8aFxM3UqdA@mail.gmail.com>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="2506"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: Stefan Kangas <stefankangas@gmail.com>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Mar 03 07:20:34 2021
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 1lHKs6-0000Zg-0S
	for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 07:20:34 +0100
Original-Received: from localhost ([::1]:49770 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 1lHKs5-0006Oo-1W
	for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Mar 2021 01:20:33 -0500
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37450)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1lHKrH-0005yu-42
 for emacs-devel@gnu.org; Wed, 03 Mar 2021 01:19:43 -0500
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:60066)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>)
 id 1lHKrG-0001WH-DT; Wed, 03 Mar 2021 01:19:42 -0500
Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4241
 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 1lHKrF-0000xx-Pk; Wed, 03 Mar 2021 01:19:42 -0500
In-Reply-To: <CADwFkmnAa6rgwi-y=0b-BSQ4hqPt4cd8ED_Ks+Ek8aFxM3UqdA@mail.gmail.com>
 (message from Stefan Kangas on Tue, 2 Mar 2021 20:08:53 -0600)
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:265861
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/265861>

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Tue, 2 Mar 2021 20:08:53 -0600
> 
>     https://lists.gnu.org/archive/html/emacs-devel/2012-01/msg00736.html
> 
> Long story short, it may be a non-trivial job.  In particular supporting
> the \s and \c operators seems like a hard nut to crack.

Yes.  But I think supporting non-ASCII characters is also not easy,
and the main reason we still don't use Gnulib's regexp code in Emacs.

Another worthy goal, if we are talking about this, is to support more
of the Unicode Regular Expressions, at least at the functional level,
if not syntactically.  See https://unicode.org/reports/tr18/ for the
details.