In registration form, I have client side validation for strength of password. For example password should be not less than 6 symbols, consists at least 1 digit, and at least 1 letter.

For example: `hello1` and `dk43do` are valid passwords, but `difmbfd` and `3242354` are not.

Is it normal to make such a validation in auth (log in) form too?
So, if user tries to log in, inputs a password, that is easy and can't be a password, it means - user had mistaken, so we should to tell him about it before he pressed `Submit`.