I'm creating an extremely difficult challenge that combines:
1. Complex nested patterns with balanced parentheses/brackets
2. Mixed-format timestamps with optional milliseconds and timezones
3. ISBN numbers with optional hyphens and both old/new formats
4. Blood pressure readings with specific constraints
5. Scientific notation numbers with sign constraints
6. Tricky negative cases that look similar but shouldn't match
The text includes valid patterns intermixed with nearly-matching invalid ones... (truncated)