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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 14 of 15

Explore more Topics under Formal Languages and Automata Theory

Q131.
Which of the following is the task of lexical analysis?

a.

To build the uniform symbol table

b.

To initialize the variables

c.

To organize the variables in a lexical order

d.

None of the mentioned

Discuss
Answer: (a).To build the uniform symbol table
Q132.
The minimum length of a string {0,1}* not in the language corresponding to the given regular expression:
(0*+1*)(0*+1*)(0*+1*)

a.

3

b.

4

c.

5

d.

6

Discuss
Answer: (b).4
Q133.
Which of the following regular expression is equivalent to R(1,0)?
R(1,0)={111*}*

a.

(11+111)*

b.

(111+1111)*

c.

(111+11*)*

d.

All of the mentioned

Discuss
Answer: (a).(11+111)*
Q134.
The minimum number of 1’s to be used in a regular expression of the given language:
R(x): The language of all strings containing exactly 2 zeroes.

a.

2

b.

3

c.

0

d.

1

Discuss
Answer: (b).3
Q135.
The given regular language corresponds to which of the given regular language
e+1+(1+0)*0+(0+1)*11

a.

The language of all strings that end with 11 or 00

b.

The language of all strings that end with 0 or 1

c.

The language of all strings which does not end with 01

d.

None of the mentioned

Discuss
Answer: (c).The language of all strings which does not end with 01
Q136.
Statement: If we take the union of two identical expression, we can replace them by one copy of the expression.
Which of the following is a correct option for the given statement?

a.

Absorption Law

b.

Idempotent Law

c.

Closure Law

d.

Commutative Law

Discuss
Answer: (b).Idempotent Law
Q137.
Which among the following can be an annihilator for multiplication operation?

a.

0

b.

1

c.

100

d.

22/7

Discuss
Answer: (a).0
Q138.
Statement: A digit, when used in the CFG notation, will always be used as a terminal.
State true or false?

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q139.
Choose the incorrect process to check whether the string belongs to the language of certain variable or not?

a.

recursive inference

b.

derivations

c.

head to body method

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q140.
Statement: Left most derivations are lengthy as compared to Right most derivations.
Choose the correct option:

a.

correct statement

b.

incorrect statement

c.

may or may not be correct

d.

depends on the language of the grammar

Discuss
Answer: (c).may or may not be correct
Page 14 of 15

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