(4) {w E (a, b)*: w has bba as a substring}O (a U b)* bbaObba (a U b)*O (a U b)* bba (a U b)*O b(a U b)* b (a U b)*a Write a regular expression to describe each of the following languages.Example: {w = {a, b}* : w has both aa and bb as substrings}Regular expression: (a U b)* aa (a U b)* bb (a U b)* U (a U b)* bb (a U b)* aa (a U b)*

(4) {w E (a, b)*: w has bba as a substring} O (a U b)* bba O bba (a U b)* O (a U b)* bba (a U b)* O b(a U b)* b (a U b)*a

(4) {w E (a, b): w has bba as a substring} O (a U b) bba O bba (a U b)* O (a U b)* bba (a U b)* O b(a U b)* b (a U b)*a

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

(4) {w E (a, b)*: w has bba as a substring}
O (a U b)* bba
Obba (a U b)*
O (a U b)* bba (a U b)*
O b(a U b)* b (a U b)*a

Write a regular expression to describe each of the following languages.
Example: {w = {a, b}* : w has both aa and bb as substrings}
Regular expression: (a U b)* aa (a U b)* bb (a U b)* U (a U b)* bb (a U b)* aa (a U b)*

Expert Solution

Step 1: Outline of the given question

(4) {w Є [a, b]*: w has bba as a substring}

a. (a U b)* bba

b. bba (a U b)*

c. (a U b) bba (a U b)*

d. b(a U b)* b (a U b)*a

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