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Postings from September 2016
On Thu Sep 15 11:34:02 2016, cpan@goess.org wrote:
> This is a bug report for perl from cpan@goess.org,
> generated with the help of perlbug 1.40 running under perl 5.25.5.
>
>
> -----------------------------------------------------------------
> [Please describe your issue here]
>
> I'm suggesting a documentation change. perlrecharclass says "Most
> characters
> that are meta characters in regular expressions...lose their special
> meaning
> and can be used inside a character class without the need to escape
> them" and
> goes on to list the ones that do need to be escaped. It does *not*
> list a '$'.
> But this will not match a dollar sign or a comma:
>
> [$,]
>
> and it would be good advice to point out that a '$' is as special
> inside a
> character class as it is anywhere else in a regular expression.
>
>
While I agree with the general thrust of the patch, I think we're going to have to brainstorm for edge cases before we nail down its final wording.
Consider the following:
#####
$ cat 129277-charclass-dollar.pl
#####
# perl
use strict;
use warnings;
use 5.10.1;
{
my $str;
local $/ = "\n";
$str = 'This is a string with hard-quoted $/ in its middle.';
say $str;
say ( ($str =~ m{[$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[\$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[^$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[^\$/]}) ? "Yes" : "No" );
$str = "This is a string with interpolated $/ in its middle.";
say $str;
say ( ($str =~ m{[$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[\$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[^$/]}) ? "Yes" : "No" );
say ( ($str =~ m{[^\$/]}) ? "Yes" : "No" );
}
__END__
#####
Output:
#####
$ perl 129277-charclass-dollar.pl
#####
This is a string with hard-quoted $/ in its middle.
No
Yes
Yes
Yes
This is a string with interpolated
in its middle.
Yes
No
Yes
Yes
#####
Is that the output we all expect? How do we describe the behavior of the "dollar-variables" inside negated character classes?
Thank you very much.
--
James E Keenan (jkeenan@cpan.org)
---
via perlbug: queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=129277
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