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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 1 of 15

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Q1.
Which of the following pairs of regular expressions are equivalent?

a.

1(01)* and (10)*1

b.

x (xx)* and (xx)*x

c.

x^+ and x^+ x^(*+)

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q2.
Which of the following are not regular?

a.

String of )’s which has length that is a perfect square

b.

Palindromes Consisting of 0’s 1’s

c.

String of 0’s whose length is a prime number

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q3.
What is the Regular Expression Matching Zero or More Specific Characters ?

a.

x

b.

#

c.

*

d.

&

Discuss
Answer: (c).*
Q4.
All…….. are automatically treated as regular expressions.

a.

Programmatic description

b.

Window

c.

Win Object

d.

Collection

Discuss
Answer: (a).Programmatic description
Q5.
Regular expression (x/y)(x/y) denotes the set

a.

{xy,xy}

b.

{xx,xy,yx,yy}

c.

{x,y}

d.

{x,y,xy}

Discuss
Answer: (b).{xx,xy,yx,yy}
Q6.
Regular expression x/y denotes the set

a.

{x,y}

b.

{xy}

c.

{x}

d.

{y}

Discuss
Answer: (a).{x,y}
Q7.
The regular expressions denote zero or more instances of an x or y is

a.

(x+y)

b.

(x+y)*

c.

(x* + y)

d.

(xy)*

Discuss
Answer: (b).(x+y)*
Q8.
The regular expression denote a language comprising all possible strings of even length over the alphabet (0, 1)

a.

1 + 0(1+0)*

b.

(0+1) (1+0)*

c.

(1+0)

d.

(00+0111+10)*

Discuss
Answer: (d).(00+0111+10)*
Q9.
The RE gives none or many instances of an x or y is

a.

(x+y)

b.

(x+y)*

c.

(x* + y)

d.

(xy)*

Discuss
Answer: (b).(x+y)*
Q10.
The RE in which any number of 0′s is followed by any number of 1′s followed by any number of 2′s is

a.

(0+1+2)*

b.

0*1*2*

c.

0* + 1 + 2

d.

(0+1)*2*

Discuss
Answer: (b).0*1*2*
Page 1 of 15

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