[{"move": {"text": "Here are some tricky identifiers mixed with junk:\n\nValid IDs:\n- ITEM-20240101-ALPHA\n- ITEM-20241231-BETA\n- ITEM-20230315-GAMMA\n- ITEM-20221102-DELTA\n\nInvalid IDs (similar but wrong):\n- ITEM-20241301-ALPHA  (invalid month)\n- ITEM-20240132-BETA   (invalid day)\n- ITEM-20250101-ALPHA   (future year - only 2022, 2023, 2024 allowed)\n- ITEM-20240101-ALPHAA (too many 'A's)\n- ITEM-20240101-ALPIA (invalid characters!)\n-  ITEM-20240101-ALPHA (leading whitespace)\n-ITEM-20240101-ALPHA    (no leading space)\n-ITEM-20240101-ALPHA-EXTRA (extra suffix)\n\nAlso, some decoy dates and words:\n2024-01-01, apple, banana, 2024/02/29, ITEM-20211231-OMEGA, ITEM-20260101-ALPHA\n\nMore valid IDs scattered: ITEM-20240229-ALPHA, plus ITEM-20231027-BETA and ITEM-20220718-GAMMA.\n\nFinal invalid ID: ITEM-20240101-ALPH\n\n", "targetItems": ["ITEM-20240101-ALPHA", "ITEM-20241231-BETA", "ITEM-20230315-GAMMA", "ITEM-20221102-DELTA", "ITEM-20240229-ALPHA", "ITEM-20231027-BETA", "ITEM-20220718-GAMMA"]}, "player": "Gemini Flash 2.0", "reasoning": "I've constructed an extremely challenging regex puzzle. It requires very precise matching of a specific ID format while excluding similar, but invalid, IDs. The valid IDs have a date part (YYYYMMDD) that requires validation (valid dates only, and years between 2022 and 2024). It also has a suffix that can only be ALPHA, BETA, GAMMA, or DELTA. The invalid examples are designed to test negative lookaheads/lookbehinds and date validation. There are also distractors and variations to increase the difficulty.", "timestamp": 1742326492744}, {"move": "\\bITEM-(202[2-4])(0[1-9]|1[0-2])(0[1-9]|[12][0-9]|3[01])-(ALPHA|BETA|GAMMA|DELTA)\\b", "player": "claude 3.7 sonnet", "reasoning": "The pattern matches the valid IDs with these components:\n1. Starts with \"ITEM-\" (anchored with word boundary to avoid partial matches)\n2. Year component: (202[2-4]) - matches years 2022, 2023, or 2024 only\n3. Month component: (0[1-9]|1[0-2]) - matches months 01-12\n4. Day component: (0[1-9]|[12][0-9]|3[01]) - matches days 01-31 (simplified approach)\n5. Hyphen followed by one of the valid suffixes: \"ALPHA\", \"BETA\", \"GAMMA\", or \"DELTA\"\n6. Ends with a word boundary to prevent matching items with extra characters\n\nThe word boundaries (\\b) at the start and end ensure we only match complete IDs, not partial matches. The pattern captures exactly the format of the valid IDs while excluding the invalid ones described in the text.", "timestamp": 1742326503953}]