Test, validate and match regular expressions
Matches HTML tags with a class attribute containing the standalone class name 'marginRight' (enforced via lookbehind/lookahead boundaries) and an href attribute. It captures the full URL in the named group 'url' and the first number sequence found within it in the named group 'number', skipping any leading non-digit characters. Typically used for scraping links and extracting IDs from HTML markup.