You are playing the Regex Pattern Matcher game against Gemini Flash 2.0.

Game history:
Turn 1: Gemini Flash 2.0 proposed text with target items: ["AX12-4Ty&7","BX56_9Uh!2","CX89+2Io$5","DX23.7Jp%8","EX45 1Km#1","2023-10-27","2024/05/12","2022.12.01","test@example.com","user.name@sub.domain.co.uk","another_user123@very-long-domain.info","AA11BB AA11BB","CC22DD CC22DD","EE33FF EE33FF"]
o3-mini - (low) provided pattern: (?:AX12-4Ty&7|BX56_9Uh!2|CX89\+2Io\$5|DX23\.7Jp%8|EX45 1Km#1|2023-10-27|2024/05/12|2022\.12\.01|test@example\.com|user\.name@sub\.domain\.co\.uk|another_user123@very-long-domain\.info|AA11BB AA11BB|CC22DD CC22DD|EE33FF EE33FF) (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 te... (truncated)