Comment by vitus

I think using pronouns with cases like I / me / my as a contrast to other nouns like "dog" would convey the difference.

> the idea that a 50 character or so regex will cover all your edge cases seems to be optimistic

At the very least. I'm thinking of Latin, where you can and will have ambiguity which declension a noun belongs to and what gender it is (e.g. frūctus (4th, m) vs pecus (3rd, f) vs pectus (3rd, n) vs actus (2nd, m)), and you just have to memorize which is which, since that entirely changes its endings as well as that of the corresponding adjective. Third declension is also wacky in that the stem isn't always present, e.g. pectus -> pectoris (where the stem here is pector-).