If I didn't have better things to do with my time, I'd write new documentation demonstrating how to write your own XML parser and propose its addition to the Perl 5 core documentation as pod/perlxml.pod. Sure, you shouldn't parse XML with regular expressions, but as Perl 5 doesn't include an XML parser and people want to parse XML with Perl 5, why not show them one awkward, fragile, and ill-advised way to do things without recommending to, as the world's most effective and capable Perl 5 programmers do, install a real XML parser from the CPAN.

(See also the debate over a proposal to revise the assemble-it-yourself, aren't-you-so-clever documentation for the minimal default Perl 5 object system borrowed wholeheartedly from Python. The mind boggles at the reticence to make things easier for novices and more consistent and clearer for the rest of us.)