It was renamed to perlre/(??{ code }) in Fri, 3 Mar 2000 02:19:50 +0000 (02:19 +0000) http://perl5.git.perl.org/perl.git/commit/14455d6cc193f1e4316f87b9dbe258db24ceb714

and finaly removed in http://search.cpan.org/dist/perl/pod/perl5100delta.pod#%28?p{}%29_has_been_removed

In reply to Re^4: Named capture backreferences cannot be used in character classes? ( (?p{ code }) became by Anonymous Monk
in thread Named capture backreferences cannot be used in character classes? by BrowserUk

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