For 6.6: How can I make "\w" match national character sets?, a note on using \p to match Unicode classes might be useful. E.g. use \p{Han} to match Chinese characters.
Comment on Re: Help me update stubborn perlfaq answers!
Can you write out a small snippet for an example? I know about such features, but I never use them and wouldn't know how to make an interesting example since I don't deal in a lot of character sets. :)