XF 1.5 Fuzzy search in tag input box


At one point I had read a post here to make the tag input box fuzzy search, rather than having to fully type the tag out from the beginning. I've since upgraded my Xenforo and that customization went away, and now I can't find the post anymore.

Does anyone happen to know how to do this? I remember it was quite simple, I think just adding a couple % signs around a variable in an sql query.