If you're a programmer new to regular expressions, this easy-to-follow guide is a great place to start. You'll learn the fundamentals step-by-step with the help of numerous examples, discovering first-hand how to match, extract, and transform text by matching specific words, characters, and patterns.
Regular expressions are an essential part of a programmer's toolkit, available in various Unix utlilities as well as programming languages such as Perl, Java, javascript, and C#. When you've finished this book, you'll be familiar with the most commonly used syntax in regular expressions, and you'll understand how using them will save you considerable time.

Discover what regular expressions are and how they work

Learn many of the differences between regular expressions used with command-line tools and in various programming languages

Apply simple methods for finding patterns in text, including digits, letters, Unicode characters, and string literals

Learn how to use zero-width assertions and lookarounds

Work with groups, backreferences, character classes, and quantifiers

Use regular expressions to mark up plain text with HTML5