Regex Tester & Validator

This regex matches an HTML <h3> tag containing PHP localization (L10n) function calls for icons and messages. It specifically targets an h3 element with the ID "title" and class "mb-0 mt-0" that includes L10n::icon, L10n::message, and L10n::label functions. It is highly useful for parsing, extracting, or replacing specific localized header templates in PHP-based web applications.