Wow, the usual madness on comp.lang.perl.misc: Abigail just did the unthinkable and killfiled Uri Guttman for posting an announcement to a Damian class in Boston! Probably time to get the popcorn and spectacte the scene for a while.
Other than that, I was just typing h2xs -b 5.5.3 -k -A -n Regexp::?? into my console, and still looking for a good replacement for ??. I was recently forced to delve into regexp.h and fiddle with the REGEXP structure. Users could be given access to this as well, methinks. Read-access for inspecting it a little but also changing it: Basically I had to find a way to create something like @- for perl5.005_03. I eventually made the whole pattern capturing but that of course shifted $<digit> to the right ($1 became $2). It's not particularly hard to revert that again. But this requires write-access to PL_curpm.