Can autocomplete return matches for internal portion of a symbol

[m-d-young]

I'm using atom and an extension for a particular grammar. I'd like to write a custom autocomplete+ provider for the grammar as well. However, one thing that I would like to do is have autocomplete return matches for inner portions of the tokens. For example, one of the snippets is "INSERTABC" but there are other snippets that start with "ABC". When I begin to type ABC, I'd like to see a list that includes all matches that contain "ABC" and not just those that start with "ABC". Is there a way to allow autocomplete+ to return matches for inner portions of the tokens?