ASCII spam fighter for Chinese sites: $wgSpamRegex='/^[[:ascii:]]*$/';#Must have at least one non-ASCII to post. Chinese spam fighter for ASCII sites: $wgSpamRegex='/[^[:ascii:]]/';#Must be pure ASCII to post.
Hmm... that doesn't seem to block the simplified chinese characters.
Maybe they used "&#...;" HTML Entities? Well then add a regexp to catch entities or whatever they are using too perhaps?