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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 12 of 15

Explore more Topics under Formal Languages and Automata Theory

Q111.
For the given syntax of sed, which among the following is not a correct option?
General syntax of sed: /pattern/action

a.

/ are used as delimiters

b.

pattern refers to a regular expression

c.

pattern refers to the string to be matched

d.

action refers to the command

Discuss
Answer: (c).pattern refers to the string to be matched
Q112.
What does grep do in UNIX?

a.

It is an editor in UNIX

b.

It searches for text patterns

c.

both a and b

d.

None of the mentioned

Discuss
Answer: (b).It searches for text patterns
Q113.
State true or false:
Statement: A regular expression is a sequence of characters that represent a pattern.

a.

true

b.

false

c.

may be

d.

can't say

Discuss
Answer: (a).true
Q114.
Which of the following options support the given statement?
Statement: A regular expression could be a fixed word or describe something like more general.

a.

This flexibility makes Regular expression invaluable.

b.

This flexibility makes the Regular expression unvaluable.

c.

both a and b

d.

None of the mentioned

Discuss
Answer: (a).This flexibility makes Regular expression invaluable.
Q115.
What does the following segment of code does?
grep -i man heroes.txt

a.

manually opens a file called heroes.txt

b.

manages heroes.txt

c.

search for “man” in the file “heroes.txt”

d.

none of the mentioned

Discuss
Answer: (c).search for “man” in the file “heroes.txt”
Q116.
What does “X?” do regular expression operator?

a.

Matches zero or more capital X’s.

b.

Matches no or one occurence of the capital letter X.

c.

Matches one or more capital X’s.

d.

All of the mentioned

Discuss
Answer: (b).Matches no or one occurence of the capital letter X.
Q117.
Which of the following does not support regular expressions?

a.

sed

b.

awk

c.

emacs

d.

none of the mentioned

Discuss
Answer: (d).none of the mentioned
Q118.
Lexemes can be referred to as:

a.

elements of lexicography

b.

sequence of alphanumeric characters in a token

c.

lexical errors

d.

none of the mentioned

Discuss
Answer: (b).sequence of alphanumeric characters in a token
Q119.
If the lexical analyser finds a lexeme with the same name as that of a reserved word,it _________

a.

overwrites the word

b.

overwrites the functionality

c.

generates an error

d.

something else

Discuss
Answer: (c).generates an error
Q120.
The methodology to show an error when the analyzer faces a keyword over an user’s input is based on:

a.

rule priority

b.

longest match rule

c.

keyword-out rule

d.

none of mentioned

Discuss
Answer: (a).rule priority
Page 12 of 15

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