pp_ctl.c (in pp_regcomp()) shows that, if the regex has magic on (which means it's a qr// regex), it extracts the regexp struct from mg->mg_obj. So that's where the "meat" of a Regexp object is.
Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re^3: Internal representation of qr// compiled regular expressions by japhy
in thread Internal representation of qr// compiled regular expressions by John M. Dlugosz

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