I tried to block 微信 in the Spam Phrases, but I couldn't get it to block the posts. The work-around is to make it a regular expression: /微信/u Additional documentation suggestion: Also (as if you didn't have enough things to do!), I recommend that you create more extensive documentation and link to it from the adminCP, especially for Unicode matching. This Regex match seems to work without the /u, but others require it. It was not easy to figure this out.