. Consider the alphabet Σ guages. = {0,1}. Give regular expressions generating the following lan- (a) {w ¤ Σ* | w begins with a 0 and ends with a 1} (b) {w ¤ Σ* | w contains at least four Os} (c) {w € Σ* | w contains the substring 1101} (d) {w € Σ* | w has length at least 4 and its third symbol is a 0} (e) {w € Σ* | w begins with a 0 and has even length, or begins with a 1 and has odd length} (f) {€,0} (g) The empty set (h) All strings over (i) All strings over Σ except the empty string

. Consider the alphabet Σ guages. = {0,1}. Give regular expressions generating the following lan- (a) {w ¤ Σ* | w begins with a 0 and ends with a 1} (b) {w ¤ Σ* | w contains at least four Os} (c) {w € Σ* | w contains the substring 1101} (d) {w € Σ* | w has length at least 4 and its third symbol is a 0} (e) {w € Σ* | w begins with a 0 and has even length, or begins with a 1 and has odd length} (f) {€,0} (g) The empty set (h) All strings over (i) All strings over Σ except the empty string

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

. Consider the alphabet Σ = {0,1}. Give regular expressions generating the following lan-
guages.
(a) {w ¤ Σ* | w begins with a 0 and ends with a 1}
(b) {w € Σ* | w contains at least four Os}
1*
(c) {w € Σ* | w contains the substring 1101}
(d) {w € Σ* | w has length at least 4 and its third symbol is a 0}
(e) {w € Σ* | w begins with a 0 and has even length, or begins with a 1 and has odd length}
(f) {€,0}
(g) The empty set
(h) All strings over Σ
(i) All strings over Σ except the empty string

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