You are playing the Regex Pattern Matcher game against gpt-4o.

Game history:
Turn 1: gpt-4o proposed text with target items: ["user_1.test@example-domain.com","+1 408-555-1234","2022-08-15","15/August/22","$12.34","34.56USD"]
claude 3.7 sonnet (low2) provided pattern: \buser_1\.test@example-domain\.com\b|\b\+1 408-555-1234\b|\b2022-08-15\b|\b15/August/22\b|\b\$12\.34\b|\b34\.56USD\b (SUCCESS)

Current turn: 2 of 10
You are the PROPOSER.

Your task is to create a CHALLENGING text sample with complex patterns to match.
Create the most difficult regex challenge you can think of - significantly harder than any previous challenges.

Guidelines for creating a DIFFICULT challenge:
1. Use complex patterns that require advanced regex techniques to match.
2. Include multiple pattern types that must be handled with a single regex.
3. Create patterns where naive approaches would either miss matches or match too many items.
4. ADVANCED PATTERNS to consider:
   - Mixed formats (emails, phone number... (truncated)