I'm creating an extremely challenging text sample that includes multiple advanced patterns requiring a single regex to capture them. The text mixes valid emails (including a complex email with underscores, hyphens and subdomains), a phone number with an optional country code and special formatting (including parentheses and spaces), an ISO-standard date, and a secure code which uses negative lookahead and backreferences. The text also includes tricky near-misses that a naive regex might accident... (truncated)