RegEx Keyword search

I am trying to run a search for two specific words, but excluding extended versions of the specific words.
This RegEx works
(?i)(\W|^)(crack|cracks|)(\W|$)
on https://regex101.com/

but when I try and run it in Autopsy it says I need to use Lucene RegEx.

Does anyone have any tips on how to reform my query? To only find teh word crack or cracks not cracking or crackers.