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You're reading from  Learning AWK Programming

Product typeBook
Published inMar 2018
Reading LevelIntermediate
PublisherPackt
ISBN-139781788391030
Edition1st Edition
Languages
AWK
Tools
Linux
Concepts
Data Analysis
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Author (1)
Shiwang Kalkhanda
Shiwang Kalkhanda
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Shiwang Kalkhanda

Shiwang Kalkhanda (RHCA, RHCSS, MCSE) is a Linux geek and consultant with expertise in the automation of infrastructure deployment and management. He has more than 10 years' experience in security, system, and network administration, and training on open source tech. For most of his automation work, he uses Shell Scripting, Python, and Go. He holds a master's and a bachelor's degree in computer applications. He enjoys traveling and spending time with his children. He is also the author of a book on text processing utilities in Unix-like environments, Learning Awk Programming.
Read more about Shiwang Kalkhanda

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Introduction to regular expressions

In this section, you will learn about regular expressions and why we use them. Then we will discuss the usage of regular expressions in AWK.

What is a regular expression?

A regular expression, or regexpr, is a set of characters used to describe a pattern. A regular expression is generally used to match lines in a file that contain a particular pattern. Many Unix utilities operate on plain text files line by line, such as grep, sed, and awk. Regular expressions search for a pattern on a single line in a file.

A regular expression doesn't search for a pattern that begins on one line and ends on another. Other programming languages may support this, notably Perl.

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Learning AWK Programming
Published in: Mar 2018Publisher: PacktISBN-13: 9781788391030
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Shiwang Kalkhanda

Shiwang Kalkhanda (RHCA, RHCSS, MCSE) is a Linux geek and consultant with expertise in the automation of infrastructure deployment and management. He has more than 10 years' experience in security, system, and network administration, and training on open source tech. For most of his automation work, he uses Shell Scripting, Python, and Go. He holds a master's and a bachelor's degree in computer applications. He enjoys traveling and spending time with his children. He is also the author of a book on text processing utilities in Unix-like environments, Learning Awk Programming.
Read more about Shiwang Kalkhanda

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