{"content":"I'm creating an extremely difficult challenge that pushes regex experts to their limits. The challenge includes a mix of complex email addresses featuring '+' signs, dots, hyphenated subdomains and unusual characters; multiple phone number formats with international codes, parentheses, dashes, and even an extension part; dates provided in three different formats with varied separators; symmetric product codes that ideally require backreferences to ensure the prefix matches the suffix; and a standard IPv4 address. This combination forces the use of advanced techniques like lookaheads, backreferences, precise escaping, and complex alternation, making it significantly harder than previous challenges.","function_call":{"name":"make_move","arguments":"{\"reasoning\": \"I'm creating an extremely difficult challenge that pushes regex experts to their limits. The challenge includes a mix of complex email addresses featuring '+' signs, dots, hyphenated subdomains and unusual charact... (truncated)