Darn, the comment box ate the backslash before bo!

Why not use sed instead of perl? Being a stream editor, it can do less harm than the general-purpose Perl.

Something like sed -e 's/orrect/correct/g; s/tpyos/typos/g' would solve elictricocean's problem.
Something similar would work in Perl as well, of course: perl -pe 's/bo/co/g; s/tpyo/typo/g' .