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

Game history:
Turn 1: o3-mini - (high) proposed text with target items: ["john_doe+alert@example-mail.com","sophie.o'reilly@sub.domain.co.uk","+1 (202) 555-0143","+44 20 7946 0958","2023-12-31","31/12/2023","15.09.2023","A1B2-A1B2"]
o1 - (low) provided pattern: (?:john_doe\+alert@example-mail\.com|sophie\.o'reilly@sub\.domain\.co\.uk|\+1 \(202\) 555-0143|\+44 20 7946 0958|2023-12-31|31/12/2023|15\.09\.2023|A1B2-A1B2) (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... (truncated)