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

Game history:
Turn 1: o3-mini - (low) proposed text with target items: ["first.last+filter@sub-domain.example.co.uk","patrick_mail@company.org","(123) 456-7890","+1-800-555.0199","user.name@deep.sub.domain.net","2023/04/01","2023-04-01","2023.04.01","name_smith@holiday-trip.net","XYZ-987","A1B2C3"]
claude 3.7 sonnet (low2) provided pattern: first\.last\+filter@sub-domain\.example\.co\.uk|patrick_mail@company\.org|\(123\) 456-7890|\+1-800-555\.0199|user\.name@deep\.sub\.domain\.net|2023/04/01|2023-04-01|2023\.04\.01|name_smith@holiday-trip\.net|XYZ-987|A1B2C3 (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... (truncated)