[HaroldPD]

Epsilon https://www.lugaru.com/

Comes sufficiently close to be worth testing the free trial.

I don't know the file size limit, but it handles multi-GB files.

Does not fulfil the hex requirement. Recognizes and edits binary files but is not a hex editor. The previously suggested https://hexfiend.com/ looks better for that.

Unlimited line length, and can either horizontally scroll long lines or wrap them for display purposes.

Fast regex.

Unlimited undo/redo, including search/replace.