What are some examples of closure properties of regular languages?

Closure properties of regular languages include:

1. Union: The union of two regular languages is also a regular language.
2. Intersection: The intersection of two regular languages is also a regular language.
3. Concatenation: The concatenation of two regular languages is also a regular language.
4. Kleene star: The Kleene star operation on a regular language results in another regular language.