Problem with character class/ranges: [-x] != [x-]

[Georg Schneemayer <ge...@schneemayer.de>]

Hi!

I've a problem with ranges. It seems that "-" acts as a range operator in a 
character class independent of its position.

[x-] matches x,y,z,... 
[-x] matches ...,v,w,x

and not only "x" and "-"

I this a bug/feature?

Perl acts different in this case, from "man perlretut":

If "'-'" is the first or last character in a character class, it is treated 
as an ordinary character; "[-ab]", "[ab-]" and "[a\-b]" are all equivalent.

What is the proposed behaviour of regexp?

Thanks in advance,
 Georg Schneemayer

Re: Problem with character class/ranges: [-x] != [x-]

[Georg Schneemayer <ge...@schneemayer.de>]

On Saturday 06 October 2001 00:28, you wrote:
> I've a problem with ranges. It seems that "-" acts as a range operator in a
> character class independent of its position.
>
> [x-] matches x,y,z,...
> [-x] matches ...,v,w,x
>
> and not only "x" and "-"
>
> I this a bug/feature?
>
> Perl acts different in this case, from "man perlretut":
>
> If "'-'" is the first or last character in a character class, it is treated
> as an ordinary character; "[-ab]", "[ab-]" and "[a\-b]" are all equivalent.
>

Oh, sorry. Now I RTFM and found this bug report which address the above:

http://nagoya.apache.org/bugzilla/show_bug.cgi?id=2121

Bye, Georg Schneemayer