Imagine we have a new programming language with identifiers that is made up from letter and digits But in an unusual way. Create a Regular Expressions for both a) where the identifier must have at least one letter, but it need not be the first character. e.g. a21, a, 2a, 321a, a321 but not 321

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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Imagine we have a new programming language with identifiers that is made up from letter and digits But in an unusual way. Create a Regular Expressions for both

a) where the identifier must have at least one letter, but it need not be the first character. e.g. a21, a, 2a, 321a, a321 but not 321

b) where the identifier must have at least one letter and there must be at least one digit before the leftmost letter. e.g. 321a, 3a21, 321abc but not a2i (no digits left of ‘a’)

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