Question

Which of the following regular expression denotes zero or more instances of an a or b?

(a) a/b

(b) (a/b)*

(c) (ab)*

(d) a*Ib

This question was posed to me by my college professor while I was bunking the class.

My doubt stems from Obtaining the regular Expression from the Finite automata topic in portion Finite Automata and Regular Expression of Compiler

Answer 1

Correct answer is (b) (a/b)*

Easiest explanation: This expression gives o or more instances of a or b.