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Regular expression for all strings starts with ab and ends with bba is.

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Regular expression for all strings starts with ab and ends with bba is.

(a) aba*b*bba

(b) ab(ab)*bba

(c) ab(a+b)*bba

(d) All of the mentioned

This question was addressed to me during a job interview.

This interesting question is from Finite Automata in chapter Finite Automata of Automata Theory

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Best answer
Correct choice is (c) ab(a+b)*bba

Best explanation: Starts with ab then any number of a or b and ends with bba.

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