t/re/pat_special_cc_thr.t See if special charclasses (\s \w \d) work the same as (\s and [\s]) under threads
t/re/pat.t See if esoteric patterns work
t/re/pat_thr.t See if esoteric patterns work in another thread
+t/re/pos.t Ensure pos() gets set properly after pre-match failures in pp_match
t/re/qr-72922.t Test for bug #72922
t/re/qr_gc.t See if qr doesn't leak
t/re/qrstack.t See if qr expands the stack properly