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

Chapter 3. Working with Groups, Capturing, and References

In this chapter, you will learn how to match, capture, and reference substrings from a given input text using regular expressions. We will cover various types of groups available in Java, and the naming and numbering of captured groups. Readers will also learn how to use back reference or forward reference of the capturing groups.

We will be covering the following topics in this chapter:

  • Grouping
  • Capturing groups
  • Group numbering
  • Non-capturing groups
  • Back references
  • Named groups
  • Forward references
  • Invalid references