[{"move": {"text": "ORDER SUMMARY:\n#ORD-2023-12A (£99) - PRD[A123-4]\n#ORD-2023-12B ($99.00) - PRD[B123-4)]\n#ORD-2023-12C (€99,50) - PRD[C123-4]\nNOT-2023-12D (¥1000) - PRD(D123-4]\nORD-2023-12E (£101.50) - PRD[E123-4]\n#ORD-2023-12F ($75.25) - PRD[F123-4]\n#ORD-2023-X12 (€43,00) - PRD[X12-34]\nORDD-2023-12H (£25) - PRD[H123-4]", "targetItems": ["#ORD-2023-12A", "#ORD-2023-12B", "#ORD-2023-12F", "#ORD-2023-X12"]}, "player": "claude 3.5 sonnet", "reasoning": "I'm creating an exceptionally difficult challenge that combines multiple complex patterns:\n1. Product codes that look similar but have subtle differences in format\n2. Prices in different currencies with optional decimal places\n3. Order references that require careful pattern matching to avoid false positives\n4. Items with special characters that need proper escaping\n5. Similar-looking patterns that should NOT match\n6. Mixed formats requiring precise pattern boundaries\nThis will challenge the solver to create a regex that handles all these cases correctly while avoiding false matches.", "timestamp": 1742324035968}, {"move": "#ORD-2023-(12[ABF]|X12)", "player": "claude 3.7 sonnet", "reasoning": "Looking at the target items, I notice they all:\n1. Start with \"#ORD-\"\n2. Have \"2023-\" in the middle\n3. End with either \"12\" followed by a single capital letter (A, B, F) or \"X12\"\n\nThe pattern I'm constructing has these components:\n- \"#ORD-2023-\" matches the common prefix\n- Then I need to match either \"12[ABF]\" or \"X12\"\n- Using the alternation operator (|) to handle these two cases\n\nThe pattern \"#ORD-2023-(12[ABF]|X12)\" will match exactly the four target items:\n- \"#ORD-2023-12A\" (matches first alternative)\n- \"#ORD-2023-12B\" (matches first alternative)\n- \"#ORD-2023-12F\" (matches first alternative)\n- \"#ORD-2023-X12\" (matches second alternative)\n\nIt won't match other items in the text because they don't have this exact pattern.", "timestamp": 1742324046026}, {"move": {"text": "Network configurations:\nRouter 1: 2001:0db8:85a3:0000:0000:8a2e:0370:7334 (primary)\nRouter 2: 2001:db8:85a3:0:0:8a2e:370:7334 (secondary)\nBackup 1: 2001:db8::1428:57ab (failover)\nLegacy: 2001:0db8::0001 (archive)\nInvalid IPs: 2001:0db8:85a3:0000:0000:8a2e:0370:7334:extra (too many segments)\nG2001:db8::370z:7334 (invalid hex character)\n2001:db8:0:0:8a2e:370-7334 (invalid separator)\n2001db8:85a3::8a2e:370:7334 (missing colon)\n::ffff:192.168.0.1 (IPv4-mapped)\nfe80::1ff:fe23:4567:890a (invalid - too many segments)\n2001:db8:: (valid compressed end)\n::1 (loopback)", "targetItems": ["2001:0db8:85a3:0000:0000:8a2e:0370:7334", "2001:db8:85a3:0:0:8a2e:370:7334", "2001:db8::1428:57ab", "2001:0db8::0001", "::ffff:192.168.0.1", "2001:db8::", "::1"]}, "player": "claude 3.7 sonnet", "reasoning": "This challenge combines several difficult regex concepts: 1) IPv6 address validation with multiple formats, 2) negative lookahead for exclusions, 3) complex boundary conditions, and 4) tricky edge cases with similar patterns that shouldn't match. The valid IPv6 addresses include compressed and uncompressed formats, with varying number of segments and hexadecimal digit combinations. I've included some invalid addresses that are very similar to the valid ones (missing colons, wrong hex characters, too many segments) to make naive matching approaches fail. This will require careful pattern construction with proper validation of hexadecimal character ranges, segment counts, and handling of the double-colon compression format correctly.", "timestamp": 1742324059704}, {"move": "^(?:2001:(?:0?db8):(?:85a3:(?:0000:0000|0:0):8a2e:0370:7334|::(?:1428:57ab|0001))|::(?:ffff:192\\.168\\.0\\.1|1)|2001:db8::)$", "player": "claude 3.5 sonnet", "reasoning": "This pattern handles all the target IPv6 addresses by:\n1. Using alternation (|) to match different formats\n2. First alternative matches the full and compressed zero forms\n3. Second alternative matches addresses with double colons\n4. Special case for IPv4-mapped address\n5. Handles loopback address ::1\n6. Anchors (^$) ensure exact matches\nThe pattern is carefully constructed to match only the valid target addresses and avoid matching invalid ones in the text.", "timestamp": 1742324077723}]