Which of the following regular expressions will match a string that contains just a floating-point number (using the rules we have been using for our grammars in class)? O 1:A-?\d+.\d+([Ee]-?\d+)?$ O 2:A-?\d+\.\d+([Ee]-?\d+)?$ O 3:A-?\d+\.\d+{[Ee]-?\d+}?$ O 4:A-?\d*\.\d*([Ee]-?\d*)?S Submit Answer

Which of the following regular expressions will match a string that contains just a floating-point number (using the rules we have been using for our grammars in class)? O 1:A-?\d+.\d+([Ee]-?\d+)?$ O 2:A-?\d+\.\d+([Ee]-?\d+)?$ O 3:A-?\d+\.\d+{[Ee]-?\d+}?$ O 4:A-?\d\.\d([Ee]-?\d*)?S Submit Answer

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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Concept explainers

Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.

Question

O 2: False
Submit Answer
Actually, this is true. \d is equivalent to [0-9] and a thing followed by zero or more of that thing is equivalent to have one or more of the thing.
Which of the following regular expressions will match a string that contains just a floating-point number (using the rules we
have been using for our grammars in class)?
O 1:^-?\d+.\d+([Ee]-?\d+)?$
O 2:A-?\d+\,\d+([Ee]-?\d+)?$
O 3:^-?\d+\.\d+{[Ee]-?\d+}?S
O 4:^-?\d*\.\d*([Ee]-?\d*)?$
Submit Answer
True or false: we can create a regular expression that is equivalent to the BNF grammar:
40°F Cloudy
Property of
!!!BEFORE YOU GET OFF THE PH
MAKE SURE YOU KNOW THE FOLI
Preferred contact method
• Full
Computer# & Room#

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