Document use of - in a regex char class.

Document use of - in a regex char class.

Subject: [PATCH] Re: regex matcher incorrect

At 13:17 +0200 1997-06-24, Ulrich Windl wrote:
>In a statement like "$_[0] =~ /^([ugoa]+)([+-=])([rwxst]*)$/;" some
>incorrect patterns were matched. As an example "go/rw" was matched.
>Adding a backslash in front of the minus, making "[+\-=]", solved the
>problem.
>
>As this is a non-obvious feature, I'd consider that as a bug. Originally
>the problem was seen on Linux running the same version of Perl.

Thanks Ulrich.  You're right.   While all UNIX-descended regular expression
packages work pretty much the same way in respect how you make "-" a member
of a character class, neither the documentation delivered with Perl nor the
book "Programming Perl" tells you what to do, and they should.  Here's a
patch to apply to the perlre.pod documentation file:

p5p-msgid: v03102804afd578bcef2c@[194.51.248.88]