As far as I understand all languages in NP are decidable. But not all decidable Languages are in NP, because NP only contains decision problems. Are there also decision problems that are decidable but not in NP?What is the relationship between NP and context-free/regular languages?Are there context-free languages in NP?Are there regular languages in NP?Are there languages in NP that are not context-free?Are there languages in NP that are not regular?
Relationship between context-free/decidable languages and NP
fl.formal languages;np