How to filter accurately?

I hope that I can use a func like ‘regexp’ because it can search accurately.

For example, here is a sentence ‘I hope that I can fly in the future’, I save it as a predicate ‘sentence’,if I give dgraph ‘fut’,it can match {‘sentence’ : ‘I hope that I can fly in the future’} because ‘future’ contains a continuous ‘fut’.Unlike ‘allofterms’ or ‘alloftext’ or others, they can only match full word like ‘future’ so I cannot use them in my actual use.

In my another topic:how to use regexp in filter, I found that ‘regexp’ has performance issues, so I want to know that if dgraph has a match function that can substitute ‘regexp’?

If you have any ideas,please leave me a message,thank you!