I'm creating an extremely challenging regex matching challenge that involves multiple formats: advanced email addresses with plus signs, hyphens, and subdomains; phone numbers with international formatting, parentheses, and optional extensions; diverse date formats using dashes, slashes, dots, and even written month names; a security code format that requires backreferences to ensure symmetry; a Windows file path with escaped backslashes; and a complex URL with query parameters and an anchor. Th... (truncated)