Java 9 Regular Expressions

✍ Scribed by Anubhava Srivastava

• Publisher: Packt Publishing
• Year: 2017
• Tongue: English
• Leaves: 197
• Edition: 1
• Category: Library

✦ Synopsis

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.
What you will learn

Understand the semantics, rules, and core concepts of writing Java code involving regular expressions
Learn about the java.util.Regex package using the Pattern class, Matcher class, code snippets, and more
Match and capture text in regex and use back-references to the captured groups
Explore Regex using Java String methods and regex capabilities in the Java Scanner API
Use zero-width assertions and lookarounds in regex
Test and optimize a poorly performing regex and various other performance tips