Regular expression java pdf

Java 9 Regular Expressions

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.

• 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

Anubhava Srivastava has more than 22 years of professional experience in architecture, design, and software development. He specializes mainly in the J2EE technology stack, web technologies, CICD, test-driven development, and AWS cloud-based development.

He is an active contributor to the Stack Overflow community. He currently stands in the top 35 users in terms of reputations out of the 7.5 million Stack Overflow users. He is passionate about regular expressions and is always willing to sharpen his regex skills further. He has answered close to 10,000 regex questions on Stack Overflow.

He has authored and released a test-driven framework, called GenericFixture, for FitNesse as an open source software.

You can follow him on Twitter at @anubhava.

1. Getting Started with Regular Expressions
2. Understanding the Core Constructs of Java Regular Expressions
3. Working with Groups, Capturing, and References
4. Regular Expression Programming Using Java String and Scanner APIs
5. Introduction to Java Regular Expression APIs — Pattern and Matcher Classes
6. Exploring Zero-width Assertions, Lookarounds, and Atomic Groups
7. Understanding the Union, Intersection, and Subtraction of Character Classes
8. Regular Expression Pitfalls, Optimization, and Performance Improvements

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Java 9 Regular Expressions published by Packt

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README.md

Java 9 Regular Expressions

This is the code repository for Java 9 Regular Expressions, published by Packt. It contains all the supporting project files necessary to work through the book from start to finish.

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 to match, extract, and transform text by matching specific words, characters, and patterns. You will begin by discovering what regular expressions are and how they work with Java. 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 and to parse source code and process log files. Finally, you will master tips, tricks, and best practices in Regex with Java.

Instructions and Navigation

Codes are not present in chapter 1,2,3,5.

All of the code is organized into folders. Each folder starts with a number followed by the application name. For example, Chapter02.

The code will look like the following:

package example.regex; public class StringMatches

The software in this book is tested on Java version 8 on Ubuntu version 16.10. However, all the examples can also be run on the Windows and macOS X operating systems.

If you have already purchased a print or Kindle version of this book, you can get a DRM-free PDF version at no cost.
Simply click on the link to claim your free PDF.

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Java 9 Regular Expressions published by Packt

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