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Postings from February 2019
On Tue, 05 Feb 2019 12:06:23 -0800, twwilliams@k12.wv.us wrote:
> On Perl 5.26 on Windows, an array or hash variable can take an integer
> as its name.
>
> C:> perl -e "@3=(10,20,30); print $3[1]"
> 20
> C:>
>
> Multiple digits work too.
>
> C:>perl -e "@217=('aa','bb','cc','dd'); print $217[2]"
> cc
> C:>
>
> ...and hashes.
>
> C:>perl -e "%217=('aa','bb','cc','dd'); print $217{aa}"
> bb
> C:>
This isn't a bug.
> ...but not scalars.
>
> C:>perl -e "$7='seven'; print $7"
> Modification of a read-only value attempted at -e line 1.
Neither is this. Numeric named scalars are reserved for regular expression captures:
C:\Users\Tony>perl -le "$_ = 'abc123'; /(\d+)/; print $1"
123
From perlvar:
Perl variable names may also be a sequence of digits, a single
punctuation character, or the two-character sequence: "^" (caret or
CIRCUMFLEX ACCENT) followed by any one of the characters "[][A-Z^_?\]".
These names are all reserved for special uses by Perl; for example, the
all-digits names are used to hold data captured by backreferences after
a regular expression match.
Tony
---
via perlbug: queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=133827
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