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.b+test@alpha-beta.com","carol99@beta.gamma.org","+1-(800)-555-0199","800.555.0199","(800) 555 0199","2020-02-29","29/02/2020","15.07.2021 08:30","xyz-xyz","ABc-123-ABc"]
claude 3.5 sonnet provided pattern: (?:(?:[a-zA-Z0-9.]+\+?[a-zA-Z0-9]+@[a-zA-Z0-9-]+\.[a-zA-Z.]+)|(?:\+1-\(800\)-555-0199|800\.555\.0199|\(800\) 555 0199)|(?:2020-02-29|29/02/2020|15\.07\.2021 08:30)|(?:xyz-xyz)|(?:ABc-123-ABc)) (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... (truncated)