I'm creating an exceptionally difficult challenge that incorporates:
1. Multiple data formats (valid/invalid UUIDs, semantic versioning with extensions, currency with different formats)
2. Special characters requiring careful escaping
3. Patterns with subtle differences where naive approaches would fail
4. Items that look similar but only specific ones should match
5. Mixed data requiring precise pattern boundaries
6. Edge cases with tricky whitespace and punctuation
7. Items requiring negative ... (truncated)