$ perl -e'binmode STDOUT, ":encoding(UTF-8)"; print chr 0xC9' | LANG=en_CA.utf8 perl a.pl 0
unix:perlio:utf8
Input = "\x{c9}" [utf8]
Outside char class: match
Inside char class:  match

$ perl -e'binmode STDOUT, ":encoding(UTF-8)"; print chr 0xC9' | LANG=en_CA.utf8 perl a.pl 1
unix:perlio:utf8
Input = "\x{c9}" [utf8]
Outside char class: no match
Inside char class:  match