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

Game history:
Turn 1: gpt-4o proposed text with target items: ["Mark.Twain_99@literature.org","sarah.o.connor12@future-tech.ai","+1-800-555-0199","(555)-267-8910","2021/12/31","Dec-25-2023","AAA111","B-2222-ZZZ"]
gpt-4.5-preview provided pattern: solve (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 numbers, dates with different separators)
   - Items with special characters... (truncated)