Regex Tester & Validator

This regular expression is designed to extract the contents of an HTML `<style>` tag. It matches everything between the opening `<style>` and closing `</style>` tags, capturing the CSS rules inside the first capturing group. By utilizing the `s` (DOTALL) flag, it ensures that the dot character matches newline characters, allowing it to successfully capture multi-line stylesheets. It is highly useful for parsing or stripping HTML documents to isolate CSS definitions.