I designed a text that forces extremely careful handling of punycode email, bracketed IPv6 addresses, advanced phone number formats, multiple date/time representations, references with parentheses and underscores, hashed values, special bracket notation, tricky partial or invalid items, Windows and Unix paths with parentheses or embedded options, etc. A naive approach will either fail to match or wrongly accept invalid items. This challenge requires advanced regex features such as negative looka... (truncated)