I'm creating an extremely difficult challenge involving mixed data types that require advanced regex techniques. The text includes emails with special characters (like plus signs, hyphens, underscores), dates in two distinct formats (YYYY/MM/DD and DD-MM-YYYY), phone numbers with international codes and varied delimiters, and an IPv4 address that should only be matched if preceded by a specific keyword (using lookbehind). It also contains tricky false positives (malformed emails, numbers that ar... (truncated)