Codezila

Theory of Automata

Assignment #2

Part #2

Regular Expression # 6

The set of strings over {a,b} that contain at least two a's or exactly two b's.

(a+b)*(a)(b*)a(a+b)*+a*b(a*)b(a*)

Regular Expression # 7

The set of strings over {a,b} that contain even length but not multiple of 3

(aa*)(aaa^)

Regular Expression # 8

The language over {a,b}contains exactly one double letter.

(ε + b)(ab) ∗aa(ba) ∗(ε + b) + (ε + a)(ba) ∗ bb(ab) ∗(ε + a)

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