Give a CFG for valid regular expressions over the alphabet Σ = {a,b}. The alphabet of your grammar should be over {a, b, (, ), U,*, A, Ø}. You may insert more parenthesis than necessary. Here we shall use A to represent the base-case regular expression symbolizing the set only containing the empty string. Use & not as part of the regular expression, but if necessary, as part of the rules of the grammar to satisfy (VUΣ)*. You must generate all syntactically valid regular expressions.
Give a CFG for valid regular expressions over the alphabet Σ = {a,b}. The alphabet of your grammar should be over {a, b, (, ), U,*, A, Ø}. You may insert more parenthesis than necessary. Here we shall use A to represent the base-case regular expression symbolizing the set only containing the empty string. Use & not as part of the regular expression, but if necessary, as part of the rules of the grammar to satisfy (VUΣ)*. You must generate all syntactically valid regular expressions.
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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Transcribed Image Text:Give a CFG for valid regular expressions over the alphabet Σ = {a,b}. The alphabet
of your grammar should be over {a, b, (,), U,*, A, Ø}. You may insert more parenthesis
than necessary. Here we shall use A to represent the base-case regular expression
symbolizing the set only containing the empty string. Use e not as part of the regular
expression, but if necessary, as part of the rules of the grammar to satisfy (VU Σ)*.
You must generate all syntactically valid regular expressions.
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