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Explain the following regular expressions: a) /\$/ b) ^[A-Z] c) [9876543210]

Explain the following regular expressions: a) /\$/ b) ^[A-Z] c) [9876543210]

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question

Explain the following regular expressions:

a) /\$/

b) ^[A-Z]

c) [9876543210]

Expert Solution
Step 1

1. /\$/  - This tests if the string or number contains the "$" sign or not. 

 

2. ^[A-Z] - 

Here  ^  Matches the beginning of the string or the beginning of a line

[A-Z] -  Matches a character in the range "A" to "Z" (char code 65 to 90). Case sensitive.

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