Thanks Orban!
I just tried your version 0.1 on my 3.70 board
Tag search seems ok, personally I dont use thread prefixes and similar threads on my board..
Other than that, all that you said should work seems to be working fine.
A few points:
1) if no results returned, I get some extra text at the end of the error message

2) should there be a way to set weights for title/postbody?
3) how can we confirm that the search cache is being used?