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.
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