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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 8 of 15

Explore more Topics under Formal Languages and Automata Theory

Q71.
Which among the following is equivalent to the given regular expression?
01*+1

a.

(01)*+1

b.

0((1)*+1)

c.

(0(1)*)+1

d.

((0*1)1*)*

Discuss
Answer: (c).(0(1)*)+1
Q72.
The total number of states required to automate the given regular expression
(00)*(11)*

a.

3

b.

4

c.

5

d.

6

Discuss
Answer: (c).5
Q73.
Generate a regular expression for the following problem statement:
Password Validation: String should be 8-15 characters long. String must contain a number, an Uppercase letter and a Lower case letter.

a.

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,15}$

b.

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{9,16}$

c.

^(?=.[a-z])(?=.[A-Z])(?=.\d).{8,15}$

d.

None of the mentioned

Discuss
Answer: (a).^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,15}$
Q74.
Generate a regular expression for the following problem statement:
P(x): String of length 6 or less for å={0,1}*

a.

(1+0+e)6

b.

(10)6

c.

(1+0)(1+0)(1+0)(1+0)(1+0)(1+0)

d.

More than one of the mentioned is correct

Discuss
Answer: (a).(1+0+e)6
Q75.
The minimum number of states required in a DFA (along with a dumping state) to check whether the 3rd bit is 1 or not for |n|>=3

a.

3

b.

4

c.

5

d.

1

Discuss
Answer: (c).5
Q76.
Which of the regular expressions corresponds to the given problem statement:
P(x): Express the identifiers in C Programming language

l=letters

d=digits

a.

(l+_)(d+_)*

b.

(l+d+_)*

c.

(l+_)(l+d+_)*

d.

(_+d)(l+d+_)*

Discuss
Answer: (c).(l+_)(l+d+_)*
Q77.
Generate a regular expression for the given language:l
L(x): {xÎ{0,1}*| x ends with 1 nd does not contain a substring 01}

a.

(0+01)*

b.

(0+01)*1

c.

(0+01)*(1+01)

d.

All of the mentioned

Discuss
Answer: (c).(0+01)*(1+01)
Q78.
The minimum number of transitions to pass to reach the final state as per the following regular expression is:
{a,b}*{baaa}

a.

4

b.

5

c.

6

d.

3

Discuss
Answer: (a).4
Q79.
Which of the following is an utility of state elimination phenomenon?

a.

DFA to NFA

b.

NFA to DFA

c.

DFA to Regular Expression

d.

All of the mentioned

Discuss
Answer: (c).DFA to Regular Expression
Q80.
If we have more than one accepting states or an accepting state with an outdegree, which of the following actions will be taken?

a.

addition of new state

b.

removal of a state

c.

make the newly added state as final

d.

more than one option is correct

Discuss
Answer: (d).more than one option is correct
Page 8 of 15

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