I'm creating an extremely difficult challenge that combines multiple pattern types requiring advanced regex techniques. This challenge includes:
1. Various email formats (standard, with plus addressing, subdomains)
2. ISO timestamps in different valid formats
3. IP addresses that need validation
4. UUIDs with specific format requirements
5. Masked credit card numbers with different masking patterns
6. Currency values with locale-specific formatting
7. Product codes with different separator style... (truncated)