{"content":"I'm creating an extremely difficult challenge using multiple pattern types that must be matched with a single regex. This includes:\n\n1. Valid IPv6 addresses in different formats (with shortened sections and full format)\n2. Valid ISBN-13 codes with different separators (hyphens, spaces, none)\n3. Credit card numbers with varying formats (spaces, dashes, or no separators)\n4. Base64 encoded strings with padding\n5. Negative lookahead/lookbehind challenges with \"almost matching\" patterns\n6. URLs with different protocols, subdomains and query parameters\n\nThe text includes both valid targets and very similar non-matching items that would be captured by naive regex approaches. For example, there are invalid IPv6 addresses with too many/few segments or invalid characters, ISBNs with incorrect check digits, and improperly formatted credit cards. This will force the opponent to build a precise regex that captures exactly the target items without false positives.","function_c... (truncated)