From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,
	PP_MIME_FAKE_ASCII_TEXT autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,5e9097cf4f3eaf57
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Received: by 10.68.232.169 with SMTP id tp9mr9343445pbc.6.1333457750746;
        Tue, 03 Apr 2012 05:55:50 -0700 (PDT)
MIME-Version: 1.0
Path: 
 r9ni13763pbh.0!nntp.google.com!news1.google.com!goblin2!goblin1!goblin.stu.neva.ru!eternal-september.org!feeder.eternal-september.org!mx04.eternal-september.org!.POSTED!not-for-mail
From: deuteros <deuteros@xrs.net>
Newsgroups: comp.lang.ada
Subject: Re: Checking to see if a string is a letter
Date: Tue, 3 Apr 2012 12:55:50 +0000 (UTC)
Organization: A noiseless patient Spider
Message-ID: <jles0m$fg6$1@dont-email.me>
References: <XnsA029E1D07C7DFUSSR@88.198.244.100>
 <2030859.0.1333426683573.JavaMail.geo-discussion-forums@pbbnv8>
 <jldvm4$8su$1@dont-email.me> <jle13q$ale$1@tornado.tornevall.net>
 <jle43k$qcc$1@dont-email.me>
 <4c3660d0-24bf-4cd8-92d0-b0e8c3e03ce8@z38g2000vbu.googlegroups.com>
Injection-Date: Tue, 3 Apr 2012 12:55:50 +0000 (UTC)
Injection-Info: mx04.eternal-september.org;
 posting-host="QF15JMfcBFrmxWoj0L/Q9g";
	logging-data="15878"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1/FYNK8RB6f0jwZf8V5BI0x/vilE/3x1J0="
User-Agent: Xnews/2009.05.01
X-Antivirus-Status: Clean
X-Antivirus: avast! (VPS 120403-1, 04/03/2012), Outbound message
Cancel-Lock: sha1:Wkgd7uZNhC0LlNs3ypuBag1862g=
Date: 2012-04-03T12:55:50+00:00
List-Id: <comp.lang.ada>

On Tue 03 Apr 2012 02:47:04a, Gautier write-only 
<gautier_niouzes@hotmail.com> wrote in news:4c3660d0-24bf-4cd8-92d0-
b0e8c3e03ce8@z38g2000vbu.googlegroups.com:

> On 3 avr, 08:07, deuteros <deute...@xrs.net> wrote:
> 
>> I mean the string contains a single letter and nothing more. For example:
>>
>> a �- Legal
>> A �- Legal
>> aa - Illegal
>> a1 - Illegal
> 
> Did you consider to use the string's length ?
> Or is the problem more complicated (wildcards etc.) ?

There are boolean operators which are also of length one.