Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder4.news.weretis.net!newsfeed.datemas.de!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed4a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.005 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'warnings': 0.04; 'compiler': 0.07; 'subject:Questions': 0.07; 'suppose': 0.07; 'literal': 0.09; 'occasionally': 0.09; 'suggest': 0.14; 'wrote': 0.14; '-tkc': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'hex': 0.16; 'inclined': 0.16; 'minus': 0.16; 'roy': 0.16; 'set,': 0.16; 'skip:[ 60': 0.16; 'skip:^ 20': 0.16; 'variations': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'user.': 0.19; 'entered': 0.20; 'example': 0.22; "i've": 0.25; 'equivalent': 0.26; 'header:In- Reply-To:1': 0.27; 'character': 0.29; "i'm": 0.30; 'url:wiki': 0.31; 'url:wikipedia': 0.31; 'this.': 0.32; "i'd": 0.34; "can't": 0.35; 'but': 0.35; 'done': 0.36; 'url:org': 0.36; 'should': 0.36; 'error.': 0.37; 'filter': 0.38; 'somebody': 0.38; 'to:addr:python- list': 0.38; 'issue': 0.38; 'to:addr:python.org': 0.39; 'letters': 0.60; 'range': 0.61; "you're": 0.61; 'smith': 0.68; 'a-z,': 0.84; 'allowable': 0.84; 'distinguish': 0.84; 'legit.': 0.84; 'received:50.22': 0.84; 'touched,': 0.84; 'visually': 0.84; 'imagine': 0.93 Date: Sun, 26 Jan 2014 13:41:41 -0600 From: Tim Chase To: python-list@python.org Subject: Re: re Questions In-Reply-To: References: <3f568767-e13a-4c7d-a4fb-85caca2adf6e@googlegroups.com> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Authenticated-Sender: tim@thechases.com X-OutGoing-Spam-Status: No, score=-6.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - boston.accountservergroup.com X-AntiAbuse: Original Domain - python.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tim.thechases.com X-Get-Message-Sender-Via: boston.accountservergroup.com: authenticated_id: tim@thechases.com X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 29 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1390765257 news.xs4all.nl 2901 [2001:888:2000:d::a6]:33839 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:64788 On 2014-01-26 12:15, Roy Smith wrote: > > The set [A-z] is equivalent to > > [ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz] =20 >=20 > I'm inclined to suggest the regex compiler should issue a warning > for this. >=20 > I've never seen a character range other than A-Z, a-z, or 0-9. > Well, I suppose A-F or a-f if you're trying to match hex digits > (and some variations on that for octal). But, I can't imagine any > example where somebody wrote A-z and it wasn't an error. I'd not object to warnings on that one literal "A-z" set, but I've done some work with VINs=C2=B9 where the allowable character-set is A-Z and digits, minus letters that can be hard to distinguish visually (I/O/Q), so I've used ^[A-HJ-NPR-Z0-9]{17}$ as a first-pass filter for VINs that were entered (often scanned, but occasionally hand-keyed). In some environments, I've been able to intercept I/O/Q and remap them accordingly to 1/0/0 to do the disambiguation for the user. So I'd not want to see other character-classes touched, as they can be perfectly legit. -tkc =C2=B9 http://en.wikipedia.org/wiki/Vehicle_Identification_Number