For each item, write a single regular expression that matches that item. Note that in ALL cases, the entire string must match without additional characters. 1. A string of digits that contains only digits and contains exactly two fives. Examples of acceptable strings include: "15445", "55", "05563" o The string should be rejected if it contains anything other than a digits. 2. A regular expression that matches a time expressed in the form "1:45 PM". o The hours part must be a number from 1 to 12, the minutes range from 00 to 59, and the time must indicate either AM or PM (uppercase only and preceded by exactly one space). 3. A regular expression that matches a string representing a comma separated list of variable names such as: hello, get_max, sum3 o A variable name consists of letters, digits, and underscores but cannot start with a digit. o There is exactly one space after every comma. No other spaces are allowed. o Commas and spaces are not allowed before the first name and after the last name.

For each item, write a single regular expression that matches that item. Note that in ALL cases, the entire string must match without additional characters. 1. A string of digits that contains only digits and contains exactly two fives. Examples of acceptable strings include: "15445", "55", "05563" o The string should be rejected if it contains anything other than a digits. 2. A regular expression that matches a time expressed in the form "1:45 PM". o The hours part must be a number from 1 to 12, the minutes range from 00 to 59, and the time must indicate either AM or PM (uppercase only and preceded by exactly one space). 3. A regular expression that matches a string representing a comma separated list of variable names such as: hello, get_max, sum3 o A variable name consists of letters, digits, and underscores but cannot start with a digit. o There is exactly one space after every comma. No other spaces are allowed. o Commas and spaces are not allowed before the first name and after the last name.

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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