I'm creating an extremely difficult challenge that combines:
1. Complex email variations with special characters and uncommon TLDs
2. ISBN numbers in different formats (10/13 digit with/without hyphens)
3. Time ranges with optional AM/PM and timezone indicators
4. Version numbers with various formats and constraints
5. Custom identifiers with specific pattern requirements
6. Tricky edge cases and near-matches that should be excluded

This challenge requires handling:
- Multiple format variations... (truncated)