Edited to clarify. Added another couple examples of support for transition.
There is no evolutionary transition-plan here; not does one appear to be possible, let alone economical, let alone particularly beneficial.
Imo the ways in which P6 design and implementation bridges with P5 demonstrate great care about interop and evolutionary transition at both a big picture and tiny detail level.
First, sticking to just regex:
It's not just regex either:
TL;DR Perl 6 accords Perl 5 special status, with many elements specifically designed to make P5/P6 interop straightforward. And, for those who want it, transition.
Please visit the IRC channel #perl6 on freenode and help improve it by constructively discussing things you think will improve transition or interop between P5 and P6. Thanks go to @Larry, @jnthn, and all who try to help. Illegitimi non carborundum! :)
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