Haskell Questions

Sup dudes, a couple of Haskell questions:

- what is the meaning of "deriving Eq", in the end of a data type definition?

- is there any native Haskell function that giving String A, String B and Int C, to check if A is only made of B and only C times. "Ron" "RonRon" 2 -> True
I could swear I saw something like that in a substring shit

>>1
- what is the meaning of "deriving Eq", in the end of a data type definition?
Any elementary Haskell tutorial tells you this.

- is there any native Haskell function that giving String A, String B and Int C, to check if A is only made of B and only C times. "Ron" "RonRon" 2 -> True
I could swear I saw something like that in a substring shit
Hoogle tells you this.