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(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
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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(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
Transcribed Image Text:(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)*
Transcribed Image Text: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)*
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(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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