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The key change here is that \d will no longer match every digit in the
+ unicode standard (there are thousands) nor will \w match every word 
+character in the standard, instead they will match precisely their PO
+SIX or Perl definition.

% perl -v # my system perl
This is perl, v5.10.0 built for i486-linux-gnu-thread-multi
% perl -E '"\x{432}" =~ /\w/ and say "matched"' # cyrillic letter v
matched

% ~/work/perl-5.11.0/perl -v
This is perl, v5.11.0 (*) built for i686-linux
...
% ~/work/perl-5.11.0/perl -I lib -CS -E '"\x{432}" =~ /\w/ and say "ma
+tched"'
matched