{"content":"This challenge features a broad range of tricky patterns (e.g., multi-part emails, phone numbers with extensions, variable date formats including leap years, IPv4 and IPv6 with invalids, color codes in hex and functional formats with valid/invalid ranges, bracket balancing requiring advanced recursion or lookbehind, repeated group capturing, valid vs invalid URLs, and a negative lookahead example). These items force advanced techniques such as negative lookbehind/lookahead, group repetition, strict validations (dates, IP addresses), domain TLD checks, etc. It's much harder than any of the previous levels.","function_call":{"name":"make_move","arguments":"{\n  \"reasoning\": \"This challenge features a broad range of tricky patterns (e.g., multi-part emails, phone numbers with extensions, variable date formats including leap years, IPv4 and IPv6 with invalids, color codes in hex and functional formats with valid/invalid ranges, bracket balancing requiring advanced recursion ... (truncated)