The documentation link to perlre you provide is for the
latest regex in Perl 5.20.1. I don't know when they changed to the
\N
(?:{..})?` but it wasn't for 5.10. Between 5.10 - 5.20 is a transitory state before Version 6.0 and not in any way stable. They will never get it right because the goal of Ver 6.0 is almost unreachable. Version 5.10 was the last stable in my opinion, as they try to eeek out the very last drops of
construct available. It's really a sad state. —
sln 21 hours ago