# Regular Expressions And Finite Automata

By : Manglika Tripathi

Updated : Feb 27, 2021, 5:06

Regular expressions and finite automata refer to the combination of the expressions gathered from automata. Each can get portrayed by limited automata or regular expressions. Questions are asked from this section every year, so by preparing well, you can fetch good marks in various competitive exams like GATE CS, ESE, JEE, SSC JE, and BARC, etc. Solving Regular expressions and finite automata GATE questions becomes easy only if you have detailed Regular expressions and finite automata study material for GATE CS. This article will guide and share some tips to solve Regular expressions and finite automata Questions accurately in the GATE exam.

## Important Regular Expressions and Finite Automata Topics for GATE CS

Considering the cumbersome syllabus, it becomes necessary to break down the striking points that demand due attention and consideration. Here is the list of Regular expressions and finite automata topics for GATE CS-

 Topic Explanation Finite State Machine It refers to the tool used for studying computation and language that are finite in nature. Finite Automation It shows 5-tuples that includes Q, Σ, q, F, δ. Each resembles different states, alphabets, and functions. Transition Diagrams It refers to the finite labelled diagram having edges and states denoting transitions. Edges show input and output.

### Tips to Solve/Prepare Regular Expressions and Finite Automata Questions

Follow these tried and tested tips to score well in GATE Exam 2021-

• Cross-check the Regular expressions and finite automata syllabus for GATE CS and curate Regular expressions and finite automata notes for GATE CS based on important topics mentioned above.
• Concoct from Regular expressions and finite automata MCQ pdf as it will improve your accuracy and paper-solving speed.
• Make Regular expressions and finite automata GATE questions and answers pdf of each topic so you can revise from it during exam times.

### Importance of Regular Expressions and Finite Automata in GATE Exam

• Regular expressions and finite automata act as a baseline for further study in the area of computation.
• It gives a golden opportunity to boost your overall imprints in the GATE exam as this topic holds maximum weightage.
• Regular expressions and finite automata is a practical topic that can be used in various real-life situations. It gets widely used in text processing utilities such as AWK and lexical analysis.
• GATE scores act as a passport for future opportunities, and Regular expressions and finite automata are one of the most prominent topics in the GATE exam.

### Most Recommended Books for Regular Expressions and Finite Automata

Check out the list of the latest books recommended by toppers and experts. Each regular expressions and finite automata book is equipped with high-quality regular expressions and finite automata GATE CS notes and regular expressions and finite automata quizzes that can help to boost your preparation.

 Book Author/Publication An Introduction to Formal Languages and Automata Peter Linz Finite Automata and Regular Expressions: Problems and Solutions J Richard Hollos Regular Languages and Finite Automata Prof. Andrew M. Pitts

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Q. Suppose L is represented by the following language- Î£*0011Î£* where Î£ ={0,1}. How many states in DFA will recognize L?

a. 4

b. 2

c. 8

Q. If two regular sets R1 and R2 get expressed by alphabet Î£ then:

a. R2 is regular

b. Î£ - R1 is regular

c. R2 âˆ© R1 is not regular

Q. Identify the correct regular expression from the following –

a. (r* s*)* = (r + s)*

b. {r+s}r2

c. (r-1)(r-2)

Q. Consider G as a context-free grammar and w is a string of length n. Suppose G is Chomsky normal form, how long will be the derivation of w in that case?

a. 2n-1 +1

b. n+1

c. 2n-1

Q. How many states does the smallest finite automation have?

1. 3 States

2. 4 States

3. 2 States