You are playing the Regex Pattern Matcher game against o3-mini - (high).

Game history:
Turn 1: o3-mini - (high) proposed text with target items: ["alice.smith+promo@example-mail.com","user_123@sub-domain.example.co.uk","+44 (20) 1234-5678","(555) 987-6543","2021/12/31","31-12-2021","2021-12-31","QAZ-123-QAZ","ZYX-999-ZYX"]
Mistral Nemo (12B) provided pattern: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}|\+?\d{1,4}?\s?\(?\d{1,3}\)?[-. (]*\d{1,4}[-.)]*|\d{4}[-/]?\d{1,2}\1?\d{1,2}|[A-Z0-9]{3}-\d{3}-[A-Z0-9]{3} (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 approac... (truncated)