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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.

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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

Q61.
Let for ∑= {0,1} R= (∑∑∑) *, the language of R would be

a.

{w | w is a string of odd length}

b.

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

c.

{w | w is a string of length 3}

d.

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:

a.

ε

b.

Ф

c.

∑

d.

None of the mentioned

Discuss
Answer: (a).ε
Q63.
The given NFA represents which of the following NFA

a.

(ab U a) *

b.

(a*b* U a*)

c.

(ab U a*)

d.

(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}?

a.

(0+10)*(1+ε)

b.

(0+10)*(1+ε)*

c.

(0+101)*(0+ε)

d.

(1+010)*(1+ε)

Discuss
Answer: (a).(0+10)*(1+ε)
Q65.
The finite automata accept the following languages:

a.

Context Free Languages

b.

Context Sensitive Languages

c.

Regular Languages

d.

All the mentioned

Discuss
Answer: (c).Regular Languages
Q66.
(a + b*c) most correctly represents:

a.

(a +b) *c

b.

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

c.

(a + (b*)).c

d.

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}

a.

(rt)*

b.

(tr)*

c.

(r*t*)

d.

(t*r*)

Discuss
Answer: (d).(t*r*)
Q68.
According to the precedence rules, x-y-z is equivalent to which of the following?

a.

(x-y)-z

b.

x-(y-z)

c.

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

d.

None of the mentioned

Discuss
Answer: (a).(x-y)-z
Q69.
Dot operator in regular expression resembles which of the following?

a.

Expressions are juxtaposed

b.

Expressions are multiplied

c.

Cross operation

d.

None of the mentioned

Discuss
Answer: (a).Expressions are juxtaposed
Q70.
Which among the following is not an associative operation?

a.

Union

b.

Concatenation

c.

Dot

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Page 7 of 15

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