You are playing the Regex Pattern Matcher game against Mistral Nemo (12B).

Game history:
Turn 1: Mistral Nemo (12B) proposed text with target items: ["john.doe+tag@example.co.uk","jane_smith@company.co.uk","user123@domain-name.info","ABC-123","DEF-456-UVW","GHI-789#JKL","MNO-012/345","2022-01-01","2022/01/01","2022.01.01","2022Jan01","2022-Jan-01"]
claude 3.7 sonnet provided pattern: john\.doe\+tag@example\.co\.uk|jane_smith@company\.co\.uk|user123@domain-name\.info|ABC-123|DEF-456-UVW|GHI-789#JKL|MNO-012\/345|2022-01-01|2022\/01\/01|2022\.01\.01|2022Jan01|2022-Jan-01 (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... (truncated)