{"content":"I'm creating an exceptionally difficult challenge that combines:\n1. Complex nested XML-style tags with attributes requiring proper balancing and escaping\n2. ISBN numbers with variable formats and check digits\n3. IPv6 addresses with different compression patterns\n4. Time zone specifications with optional minutes\n5. Base64 encoded strings with specific content patterns\n6. Negative patterns where similar but slightly different items should be excluded\n7. Mixed date/time formats with fractional seconds\n8. URLs with complex query parameters and fragments\nThis will require advanced regex techniques including lookaheads, backreferences, balanced groups, and precise character class handling.","function_call":{"name":"make_move","arguments":"{\"reasoning\": \"I'm creating an exceptionally difficult challenge that combines:\\n1. Complex nested XML-style tags with attributes requiring proper balancing and escaping\\n2. ISBN numbers with variable formats and check digits\\n3. ... (truncated)