Here are results from a default build of perl 5.10.0 on CentOS 5.3

[ian@alula ~]$ perl -e'binmode STDOUT, ":encoding(UTF-8)"; print chr 0
+xc9' | LANG=en_CA.utf8 perl test.pl 0
unix:perlio:encoding(utf-8-strict):utf8
Input = "\x{c9}" [utf8]
Outside char class: match
Inside char class:  match
[ian@alula ~]$ perl -e'binmode STDOUT, ":encoding(UTF-8)"; print chr 0
+xc9' | LANG=en_CA.utf8 perl test.pl 1
unix:perlio:encoding(utf-8-strict):utf8
Input = "\x{c9}" [utf8]
Outside char class: no match
Inside char class:  match

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In reply to Re^3: use locale behavior depends on charset of locale? by ig
in thread use locale behavior depends on charset of locale? by Anonymous Monk

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