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
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Transcribed Image Text:Process Programming Contr New Information Machine Networks Modelling Constraint Computational Learning Resor Complexity Proteins Analysis Software Algorithms Engineering Optimisation Model Foundations Constraints Applications Systems Logic Reasoning Dig Theory Data Refinement Games Search Neural Models Inference
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.
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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