Is there away to for list items in another list item using Regex

Question

I’m trying to expand my regex knowledge, and can’t figure out what I need to do to search items in one list against the items in another. My code so far below.
https://code.sololearn.com/cUOteiykBi0Z/?ref=app

Answer 1

this was a sample more or less. I was wanting to know if it’s possible