Book Image

Java 9 Regular Expressions

By : Anubhava Srivastava
Book Image

Java 9 Regular Expressions

By: Anubhava Srivastava

Overview of this book

Regular expressions are a powerful tool in the programmer's toolbox and allow pattern matching. They are also used for manipulating text and data. This book will provide you with the know-how (and practical examples) to solve real-world problems using regex in Java. You will begin by discovering what regular expressions are and how they work with Java. This easy-to-follow guide is a great place from which to familiarize yourself with the core concepts of regular expressions and to master its implementation with the features of Java 9. You will learn how to match, extract, and transform text by matching specific words, characters, and patterns. You will learn when and where to apply the methods for finding patterns in digits, letters, Unicode characters, and string literals. Going forward, you will learn to use zero-length assertions and lookarounds, parsing the source code, and processing the log files. Finally, you will master tips, tricks, and best practices in regex with Java.
Table of Contents (15 chapters)
Title page
About the Author
About the Reviewer
Customer Feedback
Free Chapter
Getting Started with Regular Expressions


In this chapter, you learned about the most important regular expression handling Java classes. The Matcher and Pattern classes are heavy and complex tools that can be used to get really far when it comes to string manipulation. We have seen an example of a compound task, transforming name-value pairs inside a string, enclosed between angular brackets. If you imagine how hard it would have been without regular expressions and these classes, then you realize the power you now have in your hand after this chapter; it is almost wizard-level.

In the next chapter, we will move on to advanced topics of regular expressions, such as zero-width assertions, using the lookahead and lookbehind assertions, atomic groups, and so on.