Laravel query bulider: reverse of "LIKE"?

I need the reverse of a LIKE comparison. For example, if my database contains a person with firstName "Daniel" and I search for first name "dan" then I want to get a hit. The query works when I use

->where('firstName', 'like', '%'.$searchTerm.'%')

What would I use if my database contains "Dan" and I want to get a hit when I search for "Daniel"?

I am using the query builder in Laravel 5.6

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