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$ perl -MO=Deparse -0lpe 's/2/4/gs' BEGIN { $/ = "\000"; $\ = "\000"; } ... $ perl -MO=Deparse -l1p0e 's/2/4/gs' BEGIN { $/ = "\000"; $\ = "\001"; } ...
$ perl -MO=Deparse -0777 -lpe 's/2/4/gs' BEGIN { $/ = undef; $\ = ""; } ...