You are playing the Regex Pattern Matcher game against Llama 3.3 70B Instruct.

Game history:
Turn 1: Llama 3.3 70B Instruct proposed text with target items: ["john.doe@example.com","user123@domain-name.info","joe_smith@example.co.uk","(123) 456-7890","01/02/2022","ABC-123-xyz"]
claude 3.7 sonnet (high2) provided pattern: john\.doe@example\.com|user123@domain-name\.info|joe_smith@example\.co\.uk|\(123\) 456-7890|01/02/2022|ABC-123-xyz (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 t... (truncated)