Thanks for pointing that out. I stand corrected. (To their credit, this is one case where the ruby docs are clear: "... Note: case replacement is effective only in ASCII region.") Oh well, room for improvement there.

Update: FWIW, a ruby user can do "gem install unicode_utils", and then do things like: 

#!/usr/bin/env ruby

require 'unicode_utils'

puts UnicodeUtils.downcase("Я")  # aka "\u042F", "CYRILLIC CAPIT
+AL LETTER YA"

[download]
It's clunky, but it works. (I wish the "code" tags here would allow a letter like "Я" to appear as such.)

In reply to Re^3: Honest question about Perl, Python and Ruby by graff
in thread Honest question about Perl, Python and Ruby by madM

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