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1. A general email address comprises the following: • an account name starting with a letter and continuing with any number of letters or digits (e.g., plc461, programming languages, etc.); • an @ character; a host with one or more sequences of letters or digits separated by periods (e.g., psu., gmail., cs10., etc.); • the last sequence must be a top-level domain (e.g., com, in, edu, org, etc.) but for the scope of this question let's limit it to 'edu' and 'org' Sample general email addresses: plc461@psu.edu

1. A general email address comprises the following: • an account name starting with a letter and continuing with any number of letters or digits (e.g., plc461, programming languages, etc.); • an @ character; a host with one or more sequences of letters or digits separated by periods (e.g., psu., gmail., cs10., etc.); • the last sequence must be a top-level domain (e.g., com, in, edu, org, etc.) but for the scope of this question let's limit it to 'edu' and 'org' Sample general email addresses: plc461@psu.edu

Database System Concepts
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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1. A general email address comprises the following: an account name starting with a letter and continuing with any number of letters or digits (e.g., plc461, programming languages, etc.); an character; • a host with one or more sequences of letters or digits separated by periods (e.g., psu., gmail., cs10., etc.); • the last sequence must be a top-level domain (e.g., com, in, edu, org, etc.) but for the scope of this question let's limit it to 'edu' and 'org'? Sample general email addresses: plc461@psu.edu programming languages@cs10.org abc@psu.edu vzs@amazon.webservices.123.org Define a context-free grammar to model this language. 2. What are terminals and nonterminals in the context of CFGs? Based on your answer for part 1 answer label/describe terminals and non-terminals in your answer.
Transcribed Image Text:1. A general email address comprises the following: an account name starting with a letter and continuing with any number of letters or digits (e.g., plc461, programming languages, etc.); an character; • a host with one or more sequences of letters or digits separated by periods (e.g., psu., gmail., cs10., etc.); • the last sequence must be a top-level domain (e.g., com, in, edu, org, etc.) but for the scope of this question let's limit it to 'edu' and 'org'? Sample general email addresses: plc461@psu.edu programming languages@cs10.org abc@psu.edu vzs@amazon.webservices.123.org Define a context-free grammar to model this language. 2. What are terminals and nonterminals in the context of CFGs? Based on your answer for part 1 answer label/describe terminals and non-terminals in your answer.
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