From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!.POSTED!not-for-mail
From: Robert Girault <r@dev.null>
Newsgroups: gmane.emacs.help
Subject: Re: re-search-forward hangs
Date: Mon, 30 Jul 2018 16:35:38 -0300
Organization: Aioe.org NNTP Server
Message-ID: <86va8w5xeu.fsf@dev.null>
References: <fd094987-d328-4882-bfb9-5c0efb1d14b7@easy-emacs.de>
	<83tvogpzcr.fsf@gnu.org>
	<mailman.4430.1532978809.1292.help-gnu-emacs@gnu.org>
NNTP-Posting-Host: blaine.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
X-Trace: blaine.gmane.org 1532979504 21064 195.159.176.226 (30 Jul 2018 19:38:24 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Mon, 30 Jul 2018 19:38:24 +0000 (UTC)
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (windows-nt)
To: help-gnu-emacs@gnu.org
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Jul 30 21:38:19 2018
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane.org
Original-Received: from lists.gnu.org ([208.118.235.17])
	by blaine.gmane.org with esmtp (Exim 4.84_2)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1fkDzm-0005Nl-Fw
	for geh-help-gnu-emacs@m.gmane.org; Mon, 30 Jul 2018 21:38:18 +0200
Original-Received: from localhost ([::1]:55559 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1fkE1t-0007zp-98
	for geh-help-gnu-emacs@m.gmane.org; Mon, 30 Jul 2018 15:40:29 -0400
Original-Path: usenet.stanford.edu!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail
Original-Newsgroups: gnu.emacs.help
Original-Lines: 26
Original-NNTP-Posting-Host: JjoR76Qgbxhqk95xNTZ79w.user.gioia.aioe.org
Original-X-Complaints-To: abuse@aioe.org
X-Notice: Filtered by postfilter v. 0.8.3
X-Gnus-Delayed: Thu, 02 Aug 2018 16:35:38 -0300
Cancel-Lock: sha1:lxLzO0+Cbj0CQlAd3m7SZWomQHg=
Original-Xref: usenet.stanford.edu gnu.emacs.help:223488
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-gnu-emacs/>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Original-Sender: "help-gnu-emacs"
	<help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.help:117613
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/117613>

Andreas Röhler <andreas.roehler@easy-emacs.de> writes:

> On 30.07.2018 16:33, Eli Zaretskii wrote:
>>> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
>>> Date: Mon, 30 Jul 2018 14:24:06 +0200
>>>
>>> (while (re-search-forward "" nil t 1))
>>>
>>> Emacs hangs.
>>>
>>> Same with plain
>>>
>>> (while (search-forward "" nil t 1))
>>>
>>> Expect it terminating.
>>>
>>> Are there reasons for this?
>>
>> Why did you expect it to terminate?
>
> Expect a call of search-forward from  EOB not being successful.

I see.  But searching for the empty string seems to be an always
successful operation as long as you have a string.  The empty string is
before or after any character in a string, so I would expect it to be
always found by {re-}search-forward.