RegexBuddy version 3.0.0 is a powerful software tool designed for creating, testing, and debugging regular expressions. Its most important features include a user-friendly interface, support for a wide range of programming languages and platforms, the ability to generate code snippets in various programming languages, and a built-in library of regular expressions for common tasks. It also includes step-by-step guidance for creating regular expressions and a debugger for testing and troubleshooting them.