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 the final chapter of this book, we discussed some common mistakes people make while writing regular expressions. These mistakes often cause some exceptions to be thrown at runtime or cause the regular expressions to fail the match unexpectedly. Then, you learned the various ways to avoid such mistakes.

We discussed catastrophic backtracking in regular expressions and the tricks to avoid excessive backtracking. By minimizing the backtracking steps, regular expressions can become really efficient.

You learned the testing and benchmarking techniques for regular expressions. Finally, we covered many regex optimization and performance enhancing tips in detail. We hope these tips help you understand the building blocks of regular expressions and write better-performing regular expressions to solve complex parsing and matching problems.