Re: perl: unsafe empty pattern behavior

Andrew Dunstan <andrew@dunslane.net> writes:
> On 2024-03-12 Tu 18:59, Tom Lane wrote:
>> I wonder whether perlcritic has sufficiently deep understanding of
>> Perl code that it could find these hazards.

> Yeah, that was my thought too. I'd start with ProhibitComplexRegexes.pm
> as a template.

Oooh.  Taking a quick look at the source code:

https://metacpan.org/dist/Perl-Critic/source/lib/Perl/Critic/Policy/RegularExpressions/ProhibitComplexRegexes.pm

it seems like it'd be pretty trivial to convert that from "complain if
regex contains more than N characters" to "complain if regex contains
zero characters".

            regards, tom lane