I'm creating an extremely difficult challenge that spans a wide variety of complex patterns. The text sample includes advanced email formats with special characters and subdomains, multiple phone number formats (with parentheses, hyphens, and dots), dates in various formats (using different separators and order), IDs that require precise matching and backreference usage, nested HTML elements with attributes, both IPv4 and IPv6 addresses (challenging numeric constraints and shorthand notation), a... (truncated)