Automatic tag autofill like on SoundCloud?

I want to implement the same system of automatic tag recognition in my Node.Js app: a user types in #word1 word2 and this is recognized as one tag with two words, not as only one tag.

I know of jquery.textcomplete and jquery.taghandler but these only can do tags that are one word long. And I need a system that would recognize tags that are phrases, like on SoundCloud:

Do you know any library that would help me do that?

Thanks!