{w € [a, b]* : every a in w is immediately preceded and followed by b}
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

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)*

Transcribed Image Text:(1) {w € [a, b}* : every a in w is immediately preceded and followed by b}
O (b*ba) *bb*
O (b*ba) *bb* U €
(b u bab)*
O (b U bab)* U€
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