From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.) Date: Sun, 01 Aug 2021 04:31:03 +0200 Message-ID: <87h7g9kiag.fsf@zoho.eu> References: <87lf61ymol.fsf@zoho.eu> <87im14xv08.fsf@zoho.eu> <20210722080643.GC11096@tuxteam.de> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="31284"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:T8C44ooOM8u8LH1V3pWJcAyozvk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Aug 01 04:31:42 2021 Return-path: Envelope-to: geh-help-gnu-emacs@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 ) id 1mA1GP-0007yW-Pm for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 01 Aug 2021 04:31:41 +0200 Original-Received: from localhost ([::1]:33156 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mA1GO-00029H-Mn for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 31 Jul 2021 22:31:40 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34202) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mA1G2-00027D-Fj for help-gnu-emacs@gnu.org; Sat, 31 Jul 2021 22:31:18 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:59330) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mA1G0-00052T-4V for help-gnu-emacs@gnu.org; Sat, 31 Jul 2021 22:31:18 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mA1Fx-0007Wr-US for help-gnu-emacs@gnu.org; Sun, 01 Aug 2021 04:31:13 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NICE_REPLY_C=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:132239 Archived-At: tomas wrote: > For example, why ^L? Because form feed is at point 12 (in > decimal) in the ascii table, and L at point 76, the > difference being 64. What happens is that the "^" "subtracts > 64 from the character code", or more precisely masks out bit > 6 of its binary representation. Cool :) $ ascii -t L @ ff | awk '{print $5}' 01001100 01000000 00001100 -- underground experts united https://dataswamp.org/~incal