Many regular expression implementations contain additional operators or symbols beyond the three basis elements and three primitive operators covered during lecture. For the expressions below, write the equivalent regular expression using only the basis elements (empty set, empty string, single alphabet symbol) and the primitive operators (Union, Concatenation, and Kleene-closure). The expression a stands for any subexpression. For simplicity, assume the alphabet is {0, 1}. (a) . matches any single alphabet symbol (b) a? optionally matches a, i.e., matches a or empty string. (c) a+ matches one or more a's. (d) a{3} matches exactly three a's. (1 2)

Many regular expression implementations contain additional operators or symbols beyond the three basis elements and three primitive operators covered during lecture. For the expressions below, write the equivalent regular expression using only the basis elements (empty set, empty string, single alphabet symbol) and the primitive operators (Union, Concatenation, and Kleene-closure). The expression a stands for any subexpression. For simplicity, assume the alphabet is {0, 1}. (a) . matches any single alphabet symbol (b) a? optionally matches a, i.e., matches a or empty string. (c) a+ matches one or more a's. (d) a{3} matches exactly three a's. (1 2)

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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