Course Solutions Uncategorized (Solved) : Gre Practice Question Following Regular Expressions Generate S String Two Consecutive 1 S Q29361717 . . . .

(Solved) : Gre Practice Question Following Regular Expressions Generate S String Two Consecutive 1 S Q29361717 . . . .

 

This is a GRE practice question.

Which of the following regular expressions generate(s) no stringwith two consecutive 1’s? (Note that ? denotes the emptystring.)

I. (1 + ?)(01 + 0)*

II. (01+10)*

III. (0+1)*(0+?)

(A) I only

(B) II only

(C) III only

(D) I and II only

(E) II and III only

The correct answer is A, but I’m not sure what ‘*’ means in thiscontext and would like if someone can breakdown how each of theseregular expressions are added to each other and multiplied.

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