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Your subroutine will accept "AK\n" as a state. Fixing that takes it to 125. But I can beat that with the following 122 character solution (which is what I was trying to figure out when I posted my first):
sub state{ $_[0]=~/^\w\w\z/&&grep/$_[0]/,'WVTNHINMSCORIDCAKSDE WIALAR MNCTX NVAZ' +,'FLGAILKTKYMAMDMEMIMOMTNDNENJNYOHOKPAUTWAWY'=~/../g }
OTOH I can improve your idea down to 119:
sub state { pop=~/^([CGILPVW]A|[CKUV]T|[HRW]I|A[KLRZ]|CO|DC|DE|FL|I[DLN]|KS|KY|M[A +DEINOST]|N[CDEHJMVY]|O[HKR]|SC|SD|TN|TX|WV|WY)\z/ }

In reply to Re (tilly) 4: Golf challange: match U.S. State names by tilly
in thread Golf challange: match U.S. State names by John M. Dlugosz

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