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Introduction
Regular expressions are a language used for parsing and manipulating text. They are often used to perform complex search-and-replace operations, and to validate that text data is well-formed.
Today, regular expressions are included in most programming languages, as well as in many scripting languages, editors, applications, databases, and command-line tools. This book aims to give quick access to the syntax and pattern-matching operations of the most popular of these languages so that you can apply your regular-expression knowledge in any environment.
The second edition of this book adds sections on Ruby and Apache web server, common regular expressions, and also updates existing languages
This book starts with a general introduction to regular expressions. The first section describes and defines the constructs used in regular expressions, and establishes the common principles of pattern matching. The remaining sections of the book are devoted to the syntax, features, and usage of regular expressions in various implementations.
The implementations covered in this book are Perl, Java™, .NET and C#, Ruby, Python, PCRE, PHP, Apache web server, vi editor, JavaScript, and shell tools.
