I'm creating a challenge that mixes several advanced regex features: email addresses with subdomains and special characters, international and local phone number formats with optional country codes and varied separators, and dates in multiple formats using different separators (slashes, dashes, dots). The text also includes similar but invalid items to increase the challenge and force precision (e.g. an invalid email, incomplete phone number, and an impossible date format). This requires the reg... (truncated)