From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: How to check whether a character (or one-character string) is a letter? Date: Sat, 04 Oct 2014 02:29:24 +0200 Message-ID: <87iok0y8wr.fsf@wmi.amu.edu.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1412382617 1588 80.91.229.3 (4 Oct 2014 00:30:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 4 Oct 2014 00:30:17 +0000 (UTC) To: "help-gnu-emacs\@gnu.org" Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Oct 04 02:30:11 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XaDEg-0000pO-NJ for geh-help-gnu-emacs@m.gmane.org; Sat, 04 Oct 2014 02:30:10 +0200 Original-Received: from localhost ([::1]:41850 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaDEg-0005uN-7i for geh-help-gnu-emacs@m.gmane.org; Fri, 03 Oct 2014 20:30:10 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:38515) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaDER-0005tV-Ca for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 20:30:00 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XaDEK-0001HN-53 for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 20:29:55 -0400 Original-Received: from msg.wmi.amu.edu.pl ([2001:808:114:2::50]:57599) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaDEJ-0001H4-Uo for help-gnu-emacs@gnu.org; Fri, 03 Oct 2014 20:29:48 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by msg.wmi.amu.edu.pl (Postfix) with ESMTP id 5762E50774 for ; Sat, 4 Oct 2014 02:29:45 +0200 (CEST) Original-Received: from msg.wmi.amu.edu.pl ([127.0.0.1]) by localhost (msg.wmi.amu.edu.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gfPxHfRgKqiZ for ; Sat, 4 Oct 2014 02:29:45 +0200 (CEST) Original-Received: from localhost (111-128.echostar.pl [213.156.111.128]) by msg.wmi.amu.edu.pl (Postfix) with ESMTPSA id 249E050773 for ; Sat, 4 Oct 2014 02:29:45 +0200 (CEST) X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:808:114:2::50 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:100256 Archived-At: Hello, this is a problem I have. Assume that I have a character (taken from some string, which in turn is copied from the buffer - so it need not be ASCII). What is the best way to check whether it is a letter within ASCII range? The reason I'm asking is that I'm writing a function which converts an arbitrary string to a valid (and nice) filename (e.g., only letters and hyphens) - so basically I want to walk a string character by character and convert any space to a hyphen and omit any other non-letter. Am I reinventing the wheel? TIA, -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Adam Mickiewicz University