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Matches YouTube URLs across multiple formats including short links (youtu.be), standard watch URLs, embed links, and playlist URLs, with optional http(s) and www prefixes. Captures three groups: the 11-character video ID, an optional index parameter (1-3 digits), and an optional 34-character playlist ID, handling both raw and HTML-encoded (&) ampersands. Useful for extracting video and playlist identifiers from text, validating user-submitted links, or parsing URLs in JavaScript applications.