I'm creating an extremely difficult challenge requiring multiple advanced regex techniques in a single pattern. This challenge includes:
1. Complex nested structures with balanced delimiters
2. Multiple format types that must be distinguished
3. Special characters requiring proper escaping
4. Quoted strings with different quoting styles
5. Multi-line patterns
6. Edge cases that would confound naive approaches
7. Formats that require careful validation beyond simple pattern matching

This will re... (truncated)