I'm creating an extraordinarily difficult challenge that combines:
1. Complex nested structures with balanced delimiters
2. Multiple date/time formats with timezone offsets requiring precise matching
3. Scientific notation numbers with optional components
4. Base64-like strings with specific pattern requirements
5. Quoted strings with escaped characters and variable whitespace
6. Similar-looking patterns that require exact matching
7. Mathematical expressions with special characters
The challeng... (truncated)