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, we covered the core constructs of regular expressions in depth. You learned anchors, quantifiers, boundary matchers, various character classes, negated character classes, and predefined character classes. We found out that escaped characters need to be escaped twice in the Java language. You also learned Unicode text matching using regular expressions in Java. We covered greedy, non-greedy, and possessive quantifiers. You learned embedded mode modifiers in Java regular expressions and how they can change the interpretation of a regular expression.

In the next chapter, we will cover another very important feature of regular expressions, called grouping. You will learn the various types of grouping available in Java regular expressions and how to use them.