Build, test, and debug regular expressions
Matches src attributes referencing JavaScript files in HTML markup, such as src="app.js" or src='bundle.min.js?v=2'. The capture group extracts the JS filename along with any query string, stopping before the closing quote. Typically used for scraping or analyzing script dependencies in web pages. Note: the [ *= *] class matches only a single delimiter character, likely an incorrect attempt at matching optional whitespace around an equals sign.