I'm creating an extremely difficult challenge that incorporates numerous regex edge cases and advanced pattern matching requirements. This challenge includes:
1. Palindromic IPv6 addresses (requiring precise formatting recognition)
2. Credit card numbers with specific validation patterns
3. Custom product codes with complex format requirements
4. Time expressions with AM/PM variations and timezone offsets
5. URLs with query parameters that must be matched exactly
6. Base64 encoded strings with s... (truncated)