[{"move": {"text": "Customer data export [2023-05-12]: \nEmail: john.doe+filter@example.com (primary), not_valid@email (rejected), jane-smith_2@company.co.uk\nIP Access: 192.168.1.1, 10.0.0.256, 172.16.254.1, 300.42.10.5, 2001:0db8:85a3:0000:0000:8a2e:0370:7334\nDates accessed: 01/02/2023, 2022-12-31, 29-Feb-2024, 31-04-2023, 2023/12/25\nProduct IDs: XYZ-1234-ABCD, ABC-5678-WXYZ, abcd-9876-efgh, ABC-DEF-123\nPurchases: $1,234.56, €2,345.67, 3,456.78¥, $99,999", "targetItems": ["john.doe+filter@example.com", "jane-smith_2@company.co.uk", "192.168.1.1", "172.16.254.1", "01/02/2023", "2022-12-31", "29-Feb-2024", "2023/12/25", "XYZ-1234-ABCD", "ABC-5678-WXYZ", "$1,234.56", "€2,345.67"]}, "player": "claude 3.7 sonnet (low2)", "reasoning": "I'm creating an extremely difficult challenge that combines multiple pattern types with tricky edge cases. This includes valid and invalid email addresses with various TLDs and formats, IP addresses mixed with similar-looking non-IPs, dates in multiple formats with different separators, product codes with specific patterns, and currency values. The regex solver will need to handle lookarounds, precise pattern matching, proper escaping of special characters, and multiple format variations while avoiding similar-looking decoys.", "timestamp": 1742326258855}, {"move": "^(?:john\\.doe\\+filter@example\\.com|jane-smith_2@company\\.co\\.uk|192\\.168\\.1\\.1|172\\.16\\.254\\.1|01\\/02\\/2023|2022-12-31|29-Feb-2024|2023\\/12\\/25|XYZ-1234-ABCD|ABC-5678-WXYZ|\\$1,234\\.56|€2,345\\.67)$", "player": "o3-mini - (low)", "reasoning": "We construct a regex pattern that exactly matches any one of the target items by combining them using the alternation operator (|) and anchoring the pattern with ^ and $. Special characters (like +, ., /, -, $, commas, etc.) are escaped as needed so that the items are matched literally. This ensures that only and exactly the provided target strings are matched and nothing else. For example, 'john.doe+filter@example.com' becomes 'john\\.doe\\+filter@example\\.com' in the pattern, and similarly for the other items. The final regex is a non-capturing group that alternates between the exact strings, ensuring all rules are met.", "timestamp": 1742326266938}, {"move": {"text": "User details: Email: bob.smith+promo@example-domain.com, alt email: bob.smith@example.com, Phone: (123) 456-7890, backup Phone: 123-456-7890. Important dates: 2024-02-29, 2023-02-29, 29/02/2024. Payment: Valid card 4111 1111 1111 1111; invalid card 4111111111111111. Reference: CA-1234-CA, fake: CA-1234-CB. Misc: Random text, 123-456, AA-9999-AA.", "targetItems": ["bob.smith+promo@example-domain.com", "(123) 456-7890", "2024-02-29", "4111 1111 1111 1111", "CA-1234-CA"]}, "player": "o3-mini - (low)", "reasoning": "I'm proposing a highly challenging regex pattern matching challenge that includes multiple complex patterns requiring advanced regex techniques such as alternations, optional groups, lookaheads/lookbehinds, and backreferences. The text sample contains emails with special characters and hyphens in the domain, phone numbers with optional parentheses and spaces, dates in ISO format with edge cases (leap year), credit card numbers delimited by spaces, and a reference code that requires a backreference (ensuring matching parts on either side). Additional non-target items are interleaved to make the challenge even harder for regex experts to craft a pattern that matches only the target items.", "timestamp": 1742326280391}, {"move": "bob\\.smith\\+promo@example-domain\\.com|\\(123\\) 456-7890|2024-02-29|4111 1111 1111 1111|CA-1234-CA", "player": "claude 3.7 sonnet (low2)", "reasoning": "I'm using alternation (|) to match any of the 5 target items. Each item is treated as a literal string with special regex characters properly escaped:\n1. For the email, I escape the dot and plus characters\n2. For the phone number, I escape the parentheses\n3. For the date, the hyphens don't need escaping\n4. For the card number, the spaces don't need escaping\n5. For the reference, the hyphens don't need escaping\n\nBy using alternation between these exact patterns, the regex will match only the specified items in the text.", "timestamp": 1742326298901}, {"move": {"text": "Valid entries: user.name+tag@example.com (primary), test-user_123@sub.domain.co.uk, https://www.example.com/path?param=value&id=123, ftp://files.server.net:21/docs/, 192.168.0.1, 2001:0db8:85a3:0000:0000:8a2e:0370:7334, #FF5733, rgb(255, 87, 51), <tag attr=\"value\">content</tag>, {\"key\": \"value\"}, 2023-02-29T15:30:45Z, (555) 123-4567, 4111-1111-1111-1111, ISBN 978-3-16-148410-0\n\nInvalid entries: username@domain, http:/invalid.com, 192.168.1, 2001:0db8:::1, #GH5733, rgb(256, 87, 51), <tag>mismatched</div>, {\"key\": value}, 2023-02-30T15:30:45Z, 555-123-4567, 4111 1111 1111 11, ISBN 978-3-16-14841-0", "targetItems": ["user.name+tag@example.com", "test-user_123@sub.domain.co.uk", "https://www.example.com/path?param=value&id=123", "ftp://files.server.net:21/docs/", "192.168.0.1", "2001:0db8:85a3:0000:0000:8a2e:0370:7334", "#FF5733", "rgb(255, 87, 51)", "<tag attr=\"value\">content</tag>", "{\"key\": \"value\"}", "2023-02-29T15:30:45Z", "(555) 123-4567", "4111-1111-1111-1111", "ISBN 978-3-16-148410-0"]}, "player": "claude 3.7 sonnet (low2)", "reasoning": "I'm designing a very challenging regex problem that combines multiple difficult techniques:\n1. Positive/negative lookahead/lookbehind requirements\n2. Mixed formats requiring precise pattern boundaries\n3. Items with special characters needing careful escaping\n4. Similar-but-different patterns where naive matching would fail\n5. Items requiring backreferences and balanced constructs\n6. Various data formats with specific validation requirements\n7. Items with subtle whitespace differences", "timestamp": 1742326316013}, {"move": "^(?:user\\.name\\+tag@example\\.com|test-user_123@sub\\.domain\\.co\\.uk|https:\\/\\/www\\.example\\.com\\/path\\?param=value&id=123|ftp:\\/\\/files\\.server\\.net:21\\/docs\\/|192\\.168\\.0\\.1|2001:0db8:85a3:0000:0000:8a2e:0370:7334|\\#FF5733|rgb\\(255, 87, 51\\)|<tag attr=\"value\">content<\\/tag>|\\{\"key\": \"value\"\\}|2023\\-02\\-29T15:30:45Z|\\(555\\) 123\\-4567|4111\\-1111\\-1111\\-1111|ISBN 978\\-3\\-16\\-148410\\-0)$", "player": "o3-mini - (low)", "reasoning": "We match the provided target strings exactly by escaping all regex special characters that appear in the literals. Our regex uses a non-capturing group with alternation (|) for each target item, and we anchor the pattern with ^ and $ to ensure we match the entire string exactly. Each target is handled by escaping characters such as ., +, ?, /, (, ), {, }, \", etc., where needed. For example, for the email 'user.name+tag@example.com' we use 'user\\.name\\+tag@example\\.com'. This ensures only and exactly the provided strings are matched. Below is the JavaScript regex as a simple string (without the surrounding slashes and flags).", "timestamp": 1742326334928}, {"move": {"text": "Here is the challenge text:\n\nStart of data:\n1. Primary Contact: complex.user+filter@example-domain.co.uk. (Do not match: complex.user@example-domain.co.uk)\n2. Event Date: 31/12/2023 occurs annually; however, note that 31-12-2023 is a distractor.\n3. Special Leap Date: 29-Feb-2024 is valid while 29/02/2024 is not to be matched.\n4. International Hotline: +44 (0)20-7946-0958 is the official number; ignore variations like +44 20 7946 0958.\n5. Resource URL: https://sub.example.com/path/to/resource?query=param&another=1; beware of similar URLs missing the subdomain or query parameters.\n6. Invoice Reference: INV-2023/04-001/XYZ is the official invoice code. Do not match INV-2023/04-001 or INV-2023-04-001-XYZ.\n7. Network Identifier: fe80::1ff:fe23:4567:890a is the designated IPv6 address; note that similar addresses lacking proper grouping or with extra sections should not match.\n\nAdditional text to distract: Random text: user+filter@example-domain.co.uk, 31-12-2023, 29/02/2024, +44 20 7946 0958, http://example.com, INV2023/04-001/XYZ, fe80:1ff:fe23:4567:890a\nEnd of data.", "targetItems": ["complex.user+filter@example-domain.co.uk", "31/12/2023", "29-Feb-2024", "+44 (0)20-7946-0958", "https://sub.example.com/path/to/resource?query=param&another=1", "INV-2023/04-001/XYZ", "fe80::1ff:fe23:4567:890a"]}, "player": "o3-mini - (low)", "reasoning": "I'm creating an extremely challenging regex pattern matching task that involves multiple advanced regex techniques in a single expression. The text includes various complex formats: a detailed email with a plus sign and subdomain requiring careful escaping, dates in different formats (slashes and dash with a month abbreviation), a telephone number with international and optional components like the zero in parentheses, a URL with query parameters containing special characters, an invoice format with embedded date and identifiers separated by mixed characters, and an IPv6 address. The text also includes distractors that are similar but should not be matched, challenging regex experts with potential pitfalls including overlapping formats, required lookahead/lookbehind logic, and careful variable whitespace handling. The regex must precisely capture only the target items and not the distracting ones. This challenge should force the solver to use advanced regex techniques like alternation, grouping, lookaheads, backreferences, and strict pattern boundaries in one single regex.", "timestamp": 1742326348459}, {"move": "complex\\.user\\+filter@example-domain\\.co\\.uk|31\\/12\\/2023|29-Feb-2024|\\+44 \\(0\\)20-7946-0958|https:\\/\\/sub\\.example\\.com\\/path\\/to\\/resource\\?query=param&another=1|INV-2023\\/04-001\\/XYZ|fe80::1ff:fe23:4567:890a", "player": "claude 3.7 sonnet (low2)", "reasoning": "I'm creating a regex pattern that matches exactly the 7 target items using alternation (|). For each item:\n1. Email: Escaped dots and plus character\n2. Date: Escaped forward slashes in format DD/MM/YYYY\n3. Date: No escaping needed for the hyphenated date with month name\n4. Phone: Escaped parentheses and plus sign\n5. URL: Escaped special characters (/, :, ?, ., etc.) and used & literal since it's not a special regex character\n6. Invoice: Escaped forward slashes\n7. IPv6: No special escaping needed for colons and alphanumeric characters\n\nI've combined all these patterns with the alternation operator (|) to match any of the target items exactly.", "timestamp": 1742326363964}, {"move": {"text": "Valid contacts: h.o'brien-smith_123+filter@example-domain.co.uk, not_this_one@domain.com, user.name@sub.domain.org (valid)\nDates: 29/02/2024 (valid leap year), 31-04-2023 (invalid date), 2023-02-29 (valid ISO).\nIPs: fe80::1ff:fe23:890a (valid IPv6), 192.168.1.256 (invalid IPv4), 2001:0db8::1428:57ab (valid).\nIDs: PRD-2023/04-XYZ-0001 (valid), PRD/2023-04-XYZ-0001 (invalid format).\nData: {\"user\":\"john\",\"age\":30} (valid JSON), <customer id=\"ABC123\">Premium</customer> (valid XML).\nCards: 4111-1111-1111-1111 (valid), 4111 1111-1111 1111 (valid with mixed separators).\nLinks: https://api.example.com/v2/users?id=123&filter[status]=active#section (valid URL).\nCodes: PREFIX:A12345-B67890 (valid), PREFIX:A12345-B67890Z (invalid code).\nPhones: +1 (555) 123-4567 (valid US), +44 7700 900123 (valid UK).", "targetItems": ["h.o'brien-smith_123+filter@example-domain.co.uk", "29/02/2024", "2023-02-29", "fe80::1ff:fe23:890a", "2001:0db8::1428:57ab", "PRD-2023/04-XYZ-0001", "{\"user\":\"john\",\"age\":30}", "<customer id=\"ABC123\">Premium</customer>", "4111-1111-1111-1111", "4111 1111-1111 1111", "https://api.example.com/v2/users?id=123&filter[status]=active#section", "PREFIX:A12345-B67890", "+1 (555) 123-4567", "+44 7700 900123"]}, "player": "claude 3.7 sonnet (low2)", "reasoning": "I'm designing an extremely difficult challenge that combines multiple pattern types requiring advanced regex techniques. This includes:\n1. Complex email formats with unusual but valid characters and tricky edge cases\n2. Dates in various formats with leap year edge cases\n3. URLs with special characters and complex query parameters\n4. IPv6 addresses with compressed notation\n5. Custom identifiers requiring precise pattern matching\n6. XML/JSON-like structures requiring proper handling of quotes and brackets\n7. Credit card numbers with various formats and separators\n8. Items with look-ahead/look-behind requirements\n9. Phone numbers in international formats\nI've also included similar but non-matching items as \"traps\" to force precise pattern matching.", "timestamp": 1742326383747}, {"move": "^(?:h\\.o'brien-smith_123\\+filter@example-domain\\.co\\.uk|29\\/02\\/2024|2023\\-02\\-29|fe80::1ff:fe23:890a|2001:0db8::1428:57ab|PRD\\-2023\\/04\\-XYZ\\-0001|\\{\"user\":\"john\",\"age\":30\\}|<customer id=\"ABC123\">Premium<\\/customer>|4111\\-1111\\-1111\\-1111|4111 1111\\-1111 1111|https:\\/\\/api\\.example\\.com\\/v2\\/users\\?id=123&filter\\[status\\]=active#section|PREFIX:A12345\\-B67890|\\+1 \\(555\\) 123\\-4567|\\+44 7700 900123)$", "player": "o3-mini - (low)", "reasoning": "The strategy is to create a regex that matches exactly one of the fixed target items, so I use an alternation of literal strings. I escape only those characters that have special meaning in regex (like ., +, (, ), ?, [, ], {, }, / etc.) and leave the other characters as literals. The entire alternation is wrapped with a non-capturing group and anchored using ^ and $. This ensures the regex matches exactly one of these items and nothing else. Below is the final regex pattern string.", "timestamp": 1742326394477}]