I'm creating an extremely difficult challenge requiring complex pattern matching. This text includes multiple advanced items (complex emails, phone numbers with optional extensions, IPv4/IPv6 addresses, mixed date formats, symmetrical patterns) along with invalid 'lookalike' patterns that are intended not to match, thus requiring powerful pattern anchors, lookarounds, and careful grouping. The single regex that matches these items must handle escaping special characters, optional components, var... (truncated)