Welcome to the Regular Expressions MCQs Page

Dive deep into the fascinating world of Regular Expressions with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Regular Expressions, a crucial aspect of Formal Languages and Automata Theory. In this section, you will encounter a diverse range of MCQs that cover various aspects of Regular Expressions, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Formal Languages and Automata Theory.

Check out the MCQs below to embark on an enriching journey through Regular Expressions. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Formal Languages and Automata Theory.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Regular Expressions. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Regular Expressions MCQs | Page 7 of 15

Explore more Topics under Formal Languages and Automata Theory

01

Basics of Automata Theory

02

Finite Automata

03

DFA Minimization

04

Context Free Grammars

05

Regular Languages

06

Push Down Automata

07

Context Free Languages

08

Introduction to Turing Machines

09

Undecidability and Intractable Problems

Q61.

Let for ∑= {0,1} R= (∑∑∑) *, the language of R would be

{w | w is a string of odd length}

{w | w is a string of length multiple of 3}

{w | w is a string of length 3}

All of the mentioned

Discuss

Answer: (b).{w | w is a string of length multiple of 3}

Q62.

If ∑= {0,1}, then Ф* will result to:

∑

None of the mentioned

Discuss

Answer: (a).ε

Q63.

The given NFA represents which of the following NFA

(ab U a) *

(a*b* U a*)

(ab U a*)

(ab)* U a*

Discuss

Answer: (a).(ab U a) *

Q64.

Which of the following represents a language which has no pair of consecutive 1’s if ∑= {0,1}?

(0+10)*(1+ε)

(0+10)*(1+ε)*

(0+101)*(0+ε)

(1+010)*(1+ε)

Discuss

Answer: (a).(0+10)*(1+ε)

Q65.

The finite automata accept the following languages:

Context Free Languages

Context Sensitive Languages

Regular Languages

All the mentioned

Discuss

Answer: (c).Regular Languages

Q66.

(a + b*c) most correctly represents:

(a +b) *c

(a)+((b)*.c)

(a + (b*)).c

a+ ((b*).c)

Discuss

Answer: (d).a+ ((b*).c)

Q67.

Which of the following regular expressions represents the set of strings which do not contain a substring ‘rt’ if ∑= {r, t}

(rt)*

(tr)*

(r*t*)

(t*r*)

Discuss

Answer: (d).(t*r*)

Q68.

According to the precedence rules, x-y-z is equivalent to which of the following?

(x-y)-z

x-(y-z)

Both (x-y)-z and x-(y-z)

None of the mentioned

Discuss

Answer: (a).(x-y)-z

Q69.

Dot operator in regular expression resembles which of the following?

Expressions are juxtaposed

Expressions are multiplied

Cross operation

None of the mentioned

Discuss

Answer: (a).Expressions are juxtaposed

Q70.

Which among the following is not an associative operation?

Union

Concatenation

Dot

None of the mentioned

Discuss

Answer: (d).None of the mentioned

Page 7 of 15

Welcome to the Regular Expressions MCQs Page

Regular Expressions MCQs | Page 7 of 15

Explore more Topics under Formal Languages and Automata Theory

Basics of Automata Theory

Finite Automata

DFA Minimization

Context Free Grammars

Regular Languages

Push Down Automata

Context Free Languages

Introduction to Turing Machines

Undecidability and Intractable Problems

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