1 Please add unit tests for the new count-only functionality.
4 This was making redundant calls to regex matching functions and so could be slower than necessary. I suggest changes that use the walrus operator to keep the same logical structure without the redundant calls.
9 Minor note: This constructor is taking a lot of arguments. This is fine, but from a style + maintainability perspective it might make sense to create a new class for the regex matching configuration and pass a configuration object to this contructor instead.