I'm creating an extremely difficult challenge by combining multiple complex pattern types with tricky edge cases. This includes:
1. IPv6 addresses with different valid formats (compressed and uncompressed)
2. Product codes with specific patterns but subtle variations in valid/invalid forms
3. Time expressions with AM/PM and timezone indicators
4. Credit card numbers with varying formats and separators
5. Similar-looking items where only some match the target pattern

The regex solver will need t... (truncated)