Give regular expressions that describe the following languages containing the set of all strings over {a, b}. a) { w | w a word in which 3rd symbol from RHS is ‘a’ and 2nd symbol is 'b' }. b) { w | w a word which contains at most one 'a' and | w | mod 3 = 2 (where | w | is the length of the word} c) { w | w a word that contains 'abba' as a substring two times } d) { w | w a word that does not contain 'abba' as a substring}
Give regular expressions that describe the following languages containing the set of all strings over {a, b}. a) { w | w a word in which 3rd symbol from RHS is ‘a’ and 2nd symbol is 'b' }. b) { w | w a word which contains at most one 'a' and | w | mod 3 = 2 (where | w | is the length of the word} c) { w | w a word that contains 'abba' as a substring two times } d) { w | w a word that does not contain 'abba' as a substring}
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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Give regular expressions that describe the following languages containing the set of all strings over {a, b}.
a) { w | w a word in which 3rd symbol from RHS is ‘a’ and 2nd symbol is 'b' }.
b) { w | w a word which contains at most one 'a' and | w | mod 3 = 2 (where | w | is the length of the word}
c) { w | w a word that contains 'abba' as a substring two times }
d) { w | w a word that does not contain 'abba' as a substring}
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