Changing XRegExp to [^\p{L}\p{thai}\s\d\-_] will solve this problem. I'm testing it right now to see if there any side effect. update: I'm already testing there are a lot of problem when this code go live but it can be fix. It's work just fine a least for now.

@aixnr Thanks u It works now

If you install mongo via apt, I believe it is mongod, but via the 10gen repository, it is mongodb

Thank you!!