multibyte support in slug?

i'm working on a website in chinese with tags. i'd like to generate
clean urls in /posts/tag/飲食. i also want to save the tag as slug. i
did changed some codes to cater multibyte support in the
Inflector::slug() of cakephp 1.2 RC3 and it worked. but the same
approach doesn't work for 1.2 final and cake gives me this error.

Warning (2): mb_ereg_replace() [function.mb-ereg-replace]: mbregex
compile err: target of repeat operator is not specified

and the result is just blank no matter what chinese text i input. does
anybody have experience with utf8 multibyte using Inflector class? i
noticed that there is Multibyte class in cake but i don't know how to
utilize it.

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