Path: utzoo!attcan!uunet!lll-winken!ames!nrl-cmf!ukma!rutgers!att!ulysses!smb
From: smb@ulysses.homer.nj.att.com (Steven M. Bellovin)
Newsgroups: comp.unix.wizards
Subject: Re: POSIX Regular Expression Funnyness
Keywords: Regular Expression,POSIX
Message-ID: <11148@ulysses.homer.nj.att.com>
Date: 27 Jan 89 04:52:36 GMT
References: <4118f7b1.ae48@apollo.COM> <9512@smoke.BRL.MIL>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 3

I suspect that POSIX is trying to deal with non-contiguous alphabets,
that is, alphabets where [a-z] does not include all lower-case letters.
Their syntax is quite ugly, though.