I'm designing an exceptionally difficult challenge that combines multiple advanced regex concepts. This text sample includes:
1. Non-standard valid emails mixed with invalid ones (requiring precise email validation)
2. IPv4 and IPv6 addresses (with decoy similar-looking strings)
3. Various date formats (YYYY-MM-DD, DD/MM/YYYY, MM-DD-YY) with validation needs
4. Product codes with complex patterns requiring specific validation rules
5. Strings that would trick greedy matching
6. Items requiring n... (truncated)