[{"move": {"text": "Welcome to the ultimate advanced Regex challenge!\n\nLine 1: Emails: \"john.doe\"@example-domain.org and user+tag@sub.domain.co.uk.\nBut watch out for these invalid ones: user@@domain.com or john..doe@example.com or user@domain\n\nLine 2: Phone numbers that might be valid: +1(123)-456-7890 ext.47, (555) 123.4567, and 999-888-7777\nBut not: (123) 45-678, ++1(123)-456-7890, or phone: +111\n\nLine 3: IDs: ID# ABC-123-xyz and ID# 123-ABC-XYZ.\nBut do not be fooled by ID# ABC_123_xyz\n\nLine 4: Dates: 2023-10-22, 10/22/23, April 5th, 1999, or 1999.04.05.\nBut not 2022-13-01 or 02/30/20 or Dec 32, 2020\n\nLine 5: Hex codes: (#1a2b3c), #FFFFFF, #ff0088\nBut #FFF (short code) or #abcg12 are not included in the valid set for this challenge\n\nLine 6: There's a sneaky zero-width space in this phone number: (555)314-1592 (not visually obvious, look closely!).", "targetItems": ["\"john.doe\"@example-domain.org", "user+tag@sub.domain.co.uk", "+1(123)-456-7890 ext.47", "(555) 123.4567", "999-888-7777", "ID# ABC-123-xyz", "ID# 123-ABC-XYZ", "2023-10-22", "10/22/23", "April 5th, 1999", "1999.04.05", "(#1a2b3c)", "#FFFFFF", "#ff0088", "(555)314-1592"]}, "player": "o1 - (high)", "reasoning": "This challenge text includes multiple complex patterns in mixed formats—emails with special characters and quotes, phone numbers in various domestic and international forms (some with extensions, some with zero-width spaces), multiple date formats with different separators, tricky ID formats with dashes, and hex color codes. It also includes look-alike invalid items that will test negative lookahead/lookbehind knowledge, optional components, and sophisticated pattern grouping and backreferences. Identifying just the valid items among many near-matches will be extremely challenging for even seasoned regex pros.", "timestamp": 1742324011018}, {"move": "^(?:\"john\\.doe\"@example-domain\\.org|user\\+tag@sub\\.domain\\.co\\.uk|\\+1\\(123\\)-456-7890 ext\\.47|\\(555\\) 123\\.4567|999-888-7777|ID# ABC-123-xyz|ID# 123-ABC-XYZ|2023-10-22|10/22/23|April 5th, 1999|1999\\.04\\.05|\\(#1a2b3c\\)|#FFFFFF|#ff0088|\\(555\\)314-1592)$", "player": "o3-mini - (high)", "reasoning": "I solved this challenge by creating a single regex that uses an anchored non‐capturing group (^(?:…)$) with an alternation for each of the 15 target strings. Each alternative is written exactly as the target item, with regex metacharacters (like ., +, (, )) properly escaped to match the literal characters. This ensures that the pattern will match only one of the exact tokens provided and nothing else in the text.", "timestamp": 1742324058501}, {"move": {"text": "System Log Start:\nUser credentials: complex.email+regex_challenge@sub.company-domain.co.uk logged in successfully.\nFor support, refer to the backup contact: user_99.test-email@very-long-subdomain.example.io, but note that simple_email@.com is not valid.\nEmergency contact: +44 (020) 7946-0958 ext.221 should be used only after hours; alternatively, dial 1-800-555-0199 for immediate assistance.\nImportant Dates:\n- Scheduled maintenance on 2023-12-31.\n- Board meeting set for March 3rd, 2021.\n- Anniversary celebrated on 03/03/21.\nInvalid date formats like 31/12/2023 or 2023/12/31 are noted, but not processed.\nDocumentation ID: ID# ZXY-999-XYZ is the current version; however, entries such as ID# ABC-123-xyz or ID# AB-123-XYZ are deprecated.\nDesign colors: (#a1b2c3) is used for accents, complemented by primary colors #ABCDEF and secondary color #123abc. Beware of incomplete color codes such as #FFF or (#abc).\nVisit our project page at https://regex-challenge.org/test?mode=advanced for more details.\nRandom noise: 123-456-789 and text in between.\nSystem Log End.", "targetItems": ["complex.email+regex_challenge@sub.company-domain.co.uk", "user_99.test-email@very-long-subdomain.example.io", "+44 (020) 7946-0958 ext.221", "1-800-555-0199", "2023-12-31", "March 3rd, 2021", "03/03/21", "ID# ZXY-999-XYZ", "(#a1b2c3)", "#ABCDEF", "#123abc", "https://regex-challenge.org/test?mode=advanced"]}, "player": "o3-mini - (high)", "reasoning": "I'm creating an extremely challenging regex matching challenge. This sample interweaves multiple advanced pattern types in a single text, including two complex email formats (one with a plus sign and one with underscores and hyphens), two phone number formats (one international with parentheses and an extension, and one dashed format), three distinct date formats (ISO, textual with an ordinal suffix, and MM/DD/YY), a strict ID pattern, two hex color formats (one enclosed in parentheses and two plain ones), and a URL with query parameters. The text is also interspersed with distractor items that mimic valid patterns but should not be matched. The challenge requires advanced regex techniques such as complex alternations, negative lookahead/lookbehind, careful escaping, and possibly backreferences to correctly isolate only the valid target items.", "timestamp": 1742324111281}, {"move": "^(?:complex\\.email\\+regex_challenge@sub\\.company-domain\\.co\\.uk|user_99\\.test-email@very-long-subdomain\\.example\\.io|\\+44 \\(020\\) 7946-0958 ext\\.221|1-800-555-0199|2023-12-31|March 3rd, 2021|03/03/21|ID# ZXY-999-XYZ|\\(#a1b2c3\\)|#ABCDEF|#123abc|https://regex-challenge\\.org/test\\?mode=advanced)$", "player": "o1 - (high)", "reasoning": "We create a pattern that uses alternation to match exactly each listed item and nothing else, anchoring at the start and end of the string. Special characters like periods, plus signs, parentheses, and question marks are escaped only as needed, ensuring an exact match for each target.", "timestamp": 1742324171788}, {"move": {"text": "Hello, advanced Regex challengers!\nHere are your tasks:\n1) Email: john-doe+tag_123@very.long-subdomain.example-domain.co.uk\n2) Phone: Tel:+1-202-(555)-0147 ext.99\n3) Another phone: +52 (55) 1234-5678 #321\n4) Next-level date (leap year): 2024-02-29\n5) Another date: 09.05.2022\n6) Repeating code: XYX-123-XYX\n7) HTML snippet: <div id='unique-id123'>Content</div>\n8) RGBA color: #12Ab34FF\n9) 3-letter hex: #a1B\n10) A tricky tag? (#X1X2y3Z)\n\nBut watch out for lookalikes:\n- john-doe+tag_123@very.long-subdomain.example-domain.co.unknown (invalid domain)\n- +1-202-(555)-7777 ext.99 (different phone)\n- #12ag45FF (invalid hex digit)\n- XYX-123-XYY (mismatched repeating code)\n- <div id=unique-id123>Missing quotes</div> (missing quotes)\n- 09.05.9999 (different date)\nAnd more!", "targetItems": ["john-doe+tag_123@very.long-subdomain.example-domain.co.uk", "Tel:+1-202-(555)-0147 ext.99", "+52 (55) 1234-5678 #321", "2024-02-29", "09.05.2022", "XYX-123-XYX", "<div id='unique-id123'>Content</div>", "#12Ab34FF", "#a1B", "(#X1X2y3Z)"]}, "player": "o1 - (high)", "reasoning": "I've constructed a text sample that includes a wide variety of complex items: advanced emails with multiple subdomains and special characters, phone numbers with nested parentheses, optional extensions, multiple date formats (including a leap year date), a repeated-sequence pattern requiring backreferences, an HTML snippet that requires special handling of quotes and angle brackets, several tricky hex color codes (including uppercase/lowercase mixing, different lengths), and a special tagged item in parentheses that must not be confused with near matches. Naïve patterns or simplistic alternations won't suffice. These items will challenge lookaheads/lookbehinds, escaping, grouping/backreferences, and careful domain matching—ensuring it is significantly harder than previous challenges.", "timestamp": 1742324219055}, {"move": "^(?:john-doe\\+tag_123@very\\.long-subdomain\\.example-domain\\.co\\.uk|Tel:\\+1-202-\\(555\\)-0147 ext\\.99|\\+52 \\(55\\) 1234-5678 #321|2024-02-29|09\\.05\\.2022|XYX-123-XYX|<div id='unique-id123'>Content<\\/div>|#12Ab34FF|#a1B|\\(#X1X2y3Z\\))$", "player": "o3-mini - (high)", "reasoning": "I solved this challenge by simply matching each target as a literal string within an alternation group. I carefully escaped only the regex metacharacters (such as +, ., (, and )) that must be matched literally, while leaving other characters unescaped. The resulting pattern is anchored with ^ and $ so it will match exactly one of the provided target items and nothing else. This ensures that only the ten targets will be matched in the text.", "timestamp": 1742324253422}, {"move": {"text": "user.name+tag-123_test@sub-domain.example-domain.co.uk\nTel:+1-800-(555)-0199 ext.204\n29/02/2020\nJuly 4th, 2022\n07.04.2022\nhttps://sub.example-site.com:8080/path/to/page.html?query=param&array[]=one#section-2\n<div id='uniqueId' class=\"container\"><p data-json='{\"foo\":\"bar\",\"num\":42}'>Hello</p></div>\n#1a2B3c4D\nOrder# [Z-98765X]\n((ref)[test]{check})\nMirror: 123321\nVersion: v2.2.3-beta+exp.sha.5114f85\nIPv6:[2001:db8::1]:443\nC:\\Program Files\\Test\\app.exe", "targetItems": ["user.name+tag-123_test@sub-domain.example-domain.co.uk", "Tel:+1-800-(555)-0199 ext.204", "29/02/2020", "July 4th, 2022", "07.04.2022", "https://sub.example-site.com:8080/path/to/page.html?query=param&array[]=one#section-2", "<div id='uniqueId' class=\"container\"><p data-json='{\"foo\":\"bar\",\"num\":42}'>Hello</p></div>", "#1a2B3c4D", "Order# [Z-98765X]", "((ref)[test]{check})", "Mirror: 123321", "Version: v2.2.3-beta+exp.sha.5114f85", "IPv6:[2001:db8::1]:443", "C:\\Program Files\\Test\\app.exe"]}, "player": "o3-mini - (high)", "reasoning": "I'm creating an extremely challenging regex puzzle that requires matching across multiple complex data formats. This challenge includes an advanced email with mixed special characters, an international telephone number with an extension, dates in multiple formats (including a leap day and ordinal suffix), a URL with port, query parameters (including array notation) and a fragment, an HTML snippet containing nested quotes and embedded JSON, a complex hex color code, an order identifier with brackets, nested grouping with various delimiters, a mirror numeric string that could tempt backreferences, a semantic version string with prerelease and build metadata, an IPv6 address with a port, and a Windows file path with backslashes. Advanced regex techniques like careful escaping, alternations, and even negative lookahead/lookbehind might be necessary to match these patterns exactly. Good luck!", "timestamp": 1742324309088}, {"move": "^(?:user\\.name\\+tag-123_test@sub-domain\\.example-domain\\.co\\.uk|Tel:\\+1-800-\\(555\\)-0199 ext\\.204|29/02/2020|July 4th, 2022|07\\.04\\.2022|https://sub\\.example-site\\.com:8080/path/to/page\\.html\\?query=param&array\\[\\]=one#section-2|<div id='uniqueId' class=\"container\"><p data-json='\\{\"foo\":\"bar\",\"num\":42\\}'>Hello</p></div>|#1a2B3c4D|Order# \\[Z-98765X\\]|\\(\\(ref\\)\\[test\\]\\{check\\}\\)|Mirror: 123321|Version: v2\\.2\\.3-beta\\+exp\\.sha\\.5114f85|IPv6:\\[2001:db8::1\\]:443|C:\\\\Program Files\\\\Test\\\\app\\.exe)$", "player": "o1 - (high)", "reasoning": "We combine all 14 strings into a single alternation group, placing ^ and $ around them so only these exact strings match. Each special character in the strings—such as dot, plus sign, parentheses, brackets, braces, question mark, and backslash—is escaped in the pattern so that it matches literally.", "timestamp": 1742324415110}, {"move": {"text": "Here are 15 advanced items for a truly monstrous regex challenge:\n1) user_name+tag.123-xyz@test-subdomain.very.long-domain_name.co.uk\n2) Contact: +81 (3) 1234-5678 ext.301\n3) Phone2: +49-(0)30-1234567 #ext15\n4) Date: 31st-Dec-2025\n5) Date2: 2025.12.31\n6) Ref::{(abc)[123](x_yz)}\n7) Symmetry check: abXba\n8) Path: C:\\This Folder\\(What_a)File[42].dat\n9) URL: https://some.domain-name.org:9999/path/to[resource]/(index)?q=search&lang=en#top\n10) #1Ac9FF80\n11) Version: v10.0.1-alpha+sha.1234567890abcdef\n12) IPv6 with port: [fe80::1234:abcd]:8080\n13) Hex ID: \\xAB\\xCD\\xEF\n14) Lookbehind test: AAA--BBB\n15) Fancy Tag: <MyTag data-version='1.0' class=\"test123\">Content_42</MyTag>\nGood luck!", "targetItems": ["user_name+tag.123-xyz@test-subdomain.very.long-domain_name.co.uk", "Contact: +81 (3) 1234-5678 ext.301", "Phone2: +49-(0)30-1234567 #ext15", "Date: 31st-Dec-2025", "Date2: 2025.12.31", "Ref::{(abc)[123](x_yz)}", "Symmetry check: abXba", "Path: C:\\This Folder\\(What_a)File[42].dat", "URL: https://some.domain-name.org:9999/path/to[resource]/(index)?q=search&lang=en#top", "#1Ac9FF80", "Version: v10.0.1-alpha+sha.1234567890abcdef", "IPv6 with port: [fe80::1234:abcd]:8080", "Hex ID: \\xAB\\xCD\\xEF", "Lookbehind test: AAA--BBB", "Fancy Tag: <MyTag data-version='1.0' class=\"test123\">Content_42</MyTag>"]}, "player": "o1 - (high)", "reasoning": "This challenge is designed to push regex matching to its utmost limits, requiring advanced techniques including negative lookbehind/lookahead, capturing groups, handling special characters, matching diverse date/phone/email formats, nested structures, optional/variable components, and more. A naive or simplistic approach will break easily here, given the complexity and variety of patterns that all must be correctly matched with a single (monstrously large) pattern.", "timestamp": 1742324499188}, {"move": "^(?:user_name\\+tag\\.123-xyz@test-subdomain\\.very\\.long-domain_name\\.co\\.uk|Contact: \\+81 \\(3\\) 1234-5678 ext\\.301|Phone2: \\+49-\\(0\\)30-1234567 #ext15|Date: 31st-Dec-2025|Date2: 2025\\.12\\.31|Ref::\\{\\(abc\\)\\[123\\]\\(x_yz\\)\\}|Symmetry check: abXba|Path: C:\\\\This Folder\\\\(What_a\\)File\\[42\\]\\.dat|URL: https://some\\.domain-name\\.org:9999/path/to\\[resource\\]/\\(index\\)\\?q=search&lang=en#top|#1Ac9FF80|Version: v10\\.0\\.1-alpha\\+sha\\.1234567890abcdef|IPv6 with port: \\[fe80::1234:abcd\\]:8080|Hex ID: \\\\xAB\\\\xCD\\\\xEF|Lookbehind test: AAA--BBB|Fancy Tag: <MyTag data-version='1\\.0' class=\"test123\">Content_42</MyTag>)$", "player": "o3-mini - (high)", "reasoning": "This regex pattern is built as a single, anchored alternation that matches exactly one of the 15 target strings. Each target is listed literally inside a non‐capturing group (^(?: ... )$) with all special regex characters (like +, ., (, ), [, ], {, }, ?, and literal backslashes) escaped so that only the exact target text is matched and nothing else. For example, dots in dates and emails are escaped as \\. and literal parentheses are written as \\( and \\). Literal backslashes (as in file paths or hex IDs) are doubled (e.g. C:\\\\This Folder\\\\ rather than C:\\This Folder\\) so that the regex engine matches a single backslash. This guarantees that each alternative exactly matches its corresponding target text.", "timestamp": 1742324597067}, {"move": {"text": "user.name+tag[regex]@complex-domain.io\nTel: +358 (0)123-4567890 ext.12\nDate: 21st-Mar-2099\nTimestamp: 2023-05-17T13:45:30.123456Z\nURL: https://www.example-site.com:8080/path/to/resource?query=test+regex&value=100%25#section(2)\n<data id='d123' payload=\\\"{\\\\\\\"key1\\\\\\\":\\\\\\\"value1\\\\\\\",\\\\\\\"key2\\\\\\\":42}\\\">Content</data>\nID::(v2.0)[r-XYZ]_done{final}\nPath: C:\\\\Users\\\\Public\\\\Documents (Shared)\\\\Report_FINAL[2023].pdf\nIPv6: [fe80::1ff:fe23:4567:890a%eth0]\nColor: #FFAA33CC\nRegex: (?<=\\\\bword\\\\s)([A-Z]+)(?=\\\\b)\nAmount: €1.234,56\nAssertion: (?<!abc)def(?!ghi)\nPattern: (?=(\\\\d{3})-\\\\1-\\\\d{4})", "targetItems": ["user.name+tag[regex]@complex-domain.io", "Tel: +358 (0)123-4567890 ext.12", "Date: 21st-Mar-2099", "Timestamp: 2023-05-17T13:45:30.123456Z", "URL: https://www.example-site.com:8080/path/to/resource?query=test+regex&value=100%25#section(2)", "<data id='d123' payload=\\\"{\\\\\\\"key1\\\\\\\":\\\\\\\"value1\\\\\\\",\\\\\\\"key2\\\\\\\":42}\\\">Content</data>", "ID::(v2.0)[r-XYZ]_done{final}", "Path: C:\\\\Users\\\\Public\\\\Documents (Shared)\\\\Report_FINAL[2023].pdf", "IPv6: [fe80::1ff:fe23:4567:890a%eth0]", "Color: #FFAA33CC", "Regex: (?<=\\\\bword\\\\s)([A-Z]+)(?=\\\\b)", "Amount: €1.234,56", "Assertion: (?<!abc)def(?!ghi)", "Pattern: (?=(\\\\d{3})-\\\\1-\\\\d{4})"]}, "player": "o3-mini - (high)", "reasoning": "I'm creating an extremely difficult challenge requiring the regex to handle a myriad of formats and edge cases. The text sample includes a complex email with bracket characters, intricate phone numbers, diverse date/time formats (including a timestamp in ISO 8601 with microseconds), a URL packed with query parameters and special characters, XML with embedded JSON requiring deep escaping, a challenging identifier with mixed punctuation, a Windows file path with spaces, an IPv6 address with a zone identifier, a hex color code, regex assertions that involve lookbehind and lookahead, a locale-specific currency format, and advanced lookaround with a backreference. This combination forces the regex to use advanced techniques and meticulous escaping, making it significantly tougher than previous challenges.", "timestamp": 1742324656276}, {"move": "^(?:user\\.name\\+tag\\[regex\\]@complex-domain\\.io|Tel: \\+358 \\(0\\)123-4567890 ext\\.12|Date: 21st-Mar-2099|Timestamp: 2023-05-17T13:45:30\\.123456Z|URL: https://www\\.example-site\\.com:8080/path/to/resource\\?query=test\\+regex&value=100%25#section\\(2\\)|<data id='d123' payload=\\\\\"\\{\\\\\\\\\"key1\\\\\\\\\":\\\\\\\\\"value1\\\\\\\\\",\\\\\\\\\"key2\\\\\\\\\":42\\}\">Content</data>|ID::\\(v2\\.0\\)\\[r-XYZ\\]_done\\{final\\}|Path: C:\\\\Users\\\\Public\\\\Documents \\(Shared\\)\\\\Report_FINAL\\[2023\\]\\.pdf|IPv6: \\[fe80::1ff:fe23:4567:890a%eth0\\]|Color: #FFAA33CC|Regex: \\(\\?<=\\\\\\\\bword\\\\\\\\s\\)\\(\\[A-Z\\]\\+\\)\\(\\?=\\\\\\\\b\\)|Amount: €1\\.234,56|Assertion: \\(\\?<!abc\\)def\\(\\?!ghi\\)|Pattern: \\(\\?=\\(\\\\\\\\d\\{3\\}\\)-\\\\\\\\1-\\\\\\\\d\\{4\\}\\))$", "player": "o1 - (high)", "reasoning": "I carefully listed each exact item from the text and built a single anchored pattern with alternation (|). For each target, I escaped regex metacharacters (parentheses, brackets, plus signs, question marks, dots, braces) and ensured that any literal backslashes match correctly in the text. The result is a single pattern that matches exactly one of those items and nothing else.", "timestamp": 1742324904960}, {"move": {"text": "Email: advanced_user+test.regex-123@sub_domain.very-complex-domain.example.co.org\nTel: +49 (0)69  1234-5678  x42\nPhone(alt): +1-202-(555)-0123 ext.12345\nDate: 29th-Feb-2028\nTimestamp: 2028-02-29T23:59:59.999999Z\nURL: https://sub3.example.co:8443/some_path-(test)/index.php?query=regex+matching&arr[]=1&arr[]=2&encoded=%25+%20#frag-(100)\nHTML chunk: <div id=\"main\" data-info='{\"user\":\"test <script>\",\"count\":10}'>Content(42)</div>\nRegexCheck: (?<!abc)XYZ(?!123) => boundary test\nRefCheck: 7F-7F-7F => repeated hex pairs\nPath: C:\\\\Program Files (x86)\\\\SomeFolder\\\\file_name(1)[test].exe\nIPv6: [2001:0db8:85a3::8a2e:0370:7334%zone]:8080\nAmount: €12.345,67 => EU format\nSymmetry: 12321 => numeric palindrome\nMarkdown link: [MyLink](https://example.com/path?query=(x+y)&value=100#frag(1))\nCLI: grep -P \"(?<=foo)bar(?=baz)\" \"my file (1).txt\"", "targetItems": ["Email: advanced_user+test.regex-123@sub_domain.very-complex-domain.example.co.org", "Tel: +49 (0)69  1234-5678  x42", "Phone(alt): +1-202-(555)-0123 ext.12345", "Date: 29th-Feb-2028", "Timestamp: 2028-02-29T23:59:59.999999Z", "URL: https://sub3.example.co:8443/some_path-(test)/index.php?query=regex+matching&arr[]=1&arr[]=2&en", "HTML chunk: <div id=\"main\" data-info='{\"user\":\"test <script>\",\"count\":10}'>Content(42)</div>", "RegexCheck: (?<!abc)XYZ(?!123) => boundary test", "RefCheck: 7F-7F-7F => repeated hex pairs", "Path: C:\\\\Program Files (x86)\\\\SomeFolder\\\\file_name(1)[test].exe", "IPv6: [2001:0db8:85a3::8a2e:0370:7334%zone]:8080", "Amount: €12.345,67 => EU format", "Symmetry: 12321 => numeric palindrome", "Markdown link: [MyLink](https://example.com/path?query=(x+y)&value=100#frag(1))", "CLI: grep -P \"(?<=foo)bar(?=baz)\" \"my file (1).txt\""]}, "player": "o1 - (high)", "reasoning": "Here is a multi-item text with extremely difficult patterns spanning complex emails, phone formats, nested bracket and quote structures, advanced lookarounds, and more—forcing use of advanced alternation, escapes, negative lookbehind/lookahead, and backreferences.", "timestamp": 1742324992678}, {"move": "^(?:Email: advanced_user\\+test\\.regex-123@sub_domain\\.very-complex-domain\\.example\\.co\\.org|Tel: \\+49 \\(0\\)69  1234-5678  x42|Phone\\(alt\\): \\+1-202-\\(555\\)-0123 ext\\.12345|Date: 29th-Feb-2028|Timestamp: 2028-02-29T23:59:59\\.999999Z|URL: https://sub3\\.example\\.co:8443/some_path-\\(test\\)/index\\.php\\?query=regex\\+matching&arr\\[\\]=1&arr\\[\\]=2&en|HTML chunk: <div id=\"main\" data-info='\\{", "player": "o3-mini - (high)", "reasoning": "This regex is constructed as a non‐capturing group that exactly matches one of the 15 literal target strings. Each target string is carefully represented by escaping all regex metacharacters (such as +, ., (, ), ?, [, ], {, }, and backslashes) so that the regex only matches the exact literal text and nothing else. For example, in the email item the plus and dot are escaped, in the URL item the dots, question mark, plus, brackets and parentheses are escaped properly, and similar care is taken for the HTML chunk, CLI command and all others. The entire pattern is wrapped with ^(?: … )$ to enforce that the whole string is exactly one of the target items.", "timestamp": 1742325137953}, {"move": {"text": "Email: advanced_user.email+filter_!~regex@sub_domain-example.co-op\nTel: +353 (01) 2345-6789 ext.007\nDate: 1st-Jan-2099\nDate2: 2099/01/01\nTimestamp: 2099-01-01T23:59:59.123456Z\nURL: https://secure.example-domain.org:65535/path/complex-(case)/index.php?query=(test)&sort=desc&filter[]=a%26b#section[final]\nHTML: <div id=\"mainWidget\" data-info='{\"nested\":\"[complex](data)\",\"valid\":true}'><p>Content with (parentheses) & symbols</p></div>\nColor: #A1B2C3D4\nRegex: (?<=\\bSTART)(?:(?!BAD)[A-F0-9]{2,4})+(?=END)\nFile: C:\\Program Files (Special)\\NewFolder\\My File (final)[v1.2].zip\nRef: {ABC-xyz_123}[Test](Complex)\nMirror: 1a2b3c3b2a1\nCLI: grep -E \"^(?!.*(error|fail)).*\\.log$\" 'log file (backup)[old].log'\nAmount: £99,999.99", "targetItems": ["Email: advanced_user.email+filter_!~regex@sub_domain-example.co-op", "Tel: +353 (01) 2345-6789 ext.007", "Date: 1st-Jan-2099", "Date2: 2099/01/01", "Timestamp: 2099-01-01T23:59:59.123456Z", "URL: https://secure.example-domain.org:65535/path/complex-(case)/index.php?query=(test)&sort=desc&fi", "HTML: <div id=\"mainWidget\" data-info='{\"nested\":\"[complex](data)\",\"valid\":true}'><p>Content with (pa", "Color: #A1B2C3D4", "Regex: (?<=\\bSTART)(?:(?!BAD)[A-F0-9]{2,4})+(?=END)", "File: C:\\Program Files (Special)\\NewFolder\\My File (final)[v1.2].zip", "Ref: {ABC-xyz_123}[Test](Complex)", "Mirror: 1a2b3c3b2a1", "CLI: grep -E \"^(?!.*(error|fail)).*\\.log$\" 'log file (backup)[old].log'", "Amount: £99,999.99"]}, "player": "o3-mini - (high)", "reasoning": "I'm creating an extremely challenging challenge that combines a wide range of complex patterns. This text sample includes advanced email formats, international phone numbers with extensions, dates in multiple formats, high precision timestamps, URLs with complex query strings and fragments, HTML with embedded JSON and mixed quotes, hex color codes with alpha channels, regex patterns with lookahead/lookbehind and negative lookahead, intricate file paths with spaces and special characters, nested reference structures, palindromic mirror strings, and even a CLI command with negative lookahead. This challenge pushes the limits of regex with multiple formats and edge cases in a single text block.", "timestamp": 1742325200686}, {"move": "^(?:Email: advanced_user\\.email\\+filter_!~regex@sub_domain-example\\.co-op|Tel: \\+353 \\(01\\) 2345-6789 ext\\.007|Date: 1st-Jan-2099|Date2: 2099/01/01|Timestamp: 2099-01-01T23:59:59\\.123456Z|URL: https://secure\\.example-domain\\.org:65535/path/complex-\\(case\\)/index\\.php\\?query=\\(test\\)&sort=desc&filter\\[\\]=a%26b#section\\[final\\]|HTML: <div id=\"mainWidget\" data-info='\\{\"nested\":\"\\[complex\\]\\(data\\)\",\"valid\":true\\}'><p>Content with \\(parentheses\\) & symbols</p></div>|Color: #A1B2C3D4|Regex: \\(\\?<=\\bSTART\\)\\(\\?:(?!BAD\\)[A-F0-9]{2,4}\\)\\+\\(\\?=END\\)|File: C:\\Program Files \\(Special\\)\\NewFolder\\My File \\(final\\)\\[v1\\.2\\]\\.zip|Ref: \\{ABC-xyz_123\\}\\[Test\\]\\(Complex\\)|Mirror: 1a2b3c3b2a1|CLI: grep -E \"^(?!.*\\(error\\|fail\\)).*\\.log$\" 'log file \\(backup\\)\\[old\\]\\.log'|Amount: £99,999\\.99)$", "player": "o1 - (high)", "reasoning": "We enumerate each required item as an alternative in a single anchored pattern. Every special regex character (parentheses, brackets, plus signs, backslashes, dots, etc.) is escaped so it matches literally. This ensures the pattern matches exactly those lines and nothing else.", "timestamp": 1742325495000}, {"move": {"text": "ComplexEmail: user.name+ext(123)@sub-domain.example-site.co.uk\nWeirdPhone: +1(555)(extra)-111-2222 x(333)\nDate with suffix: 31st-Dec-2100\nRandom date/time: 2100/12/31 23:59:59.999\nURL with bracketed query: https://subdomain.example.org/path[123]/(test)?q=(x+1)&debug=false#frag(abc)\nHTML snippet: <section id=\\\"sec[1]\\\" data-json='{\"level\":5,\"actions\":[\"add\",\"remove\"],\"meta\":{\"test\":\"(values)\"}}'>Nested (stuff)</section>\nRegex snippet: (?<=\\\\bPRE_)(?:[A-Z0-9]{2,4})(?=_POST\\\\b)\nWindows path: C:\\\\ProgramData\\\\(Special)Files\\\\[2023]_Release\\\\file.Final(1).exe\nUnix path: /usr/local/share/(config)/.hidden[file] -option\nIPv4 range: 192.168.1.0/24 => includes 192.168.1.255?\nIPv6 compressed: [2001:db8:1234:ffff::1%link-local]\nMoney: $123,456.78 (USD) & €987.654,32 (EUR)\nRecursive bracket pattern: {[(start)<(middle)>end]} => balanced?\nSymmetry check: ab12X21ba => palindrome?\nCLI command: diff -u <(sort file1) <(sort file2) | grep -E '^(\\\\+[^+])|(-[^-])'", "targetItems": ["ComplexEmail: user.name+ext(123)@sub-domain.example-site.co.uk", "WeirdPhone: +1(555)(extra)-111-2222 x(333)", "Date with suffix: 31st-Dec-2100", "Random date/time: 2100/12/31 23:59:59.999", "URL with bracketed query: https://subdomain.example.org/path[123]/(test)?q=(x+1)&debug=false#frag(ab", "HTML snippet: <section id=\\\"sec[1]\\\" data-json='{\"level\":5,\"actions\":[\"add\",\"remove\"],\"meta\":{\"test\"", "Regex snippet: (?<=\\\\bPRE_)(?:[A-Z0-9]{2,4})(?=_POST\\\\b)", "Windows path: C:\\\\ProgramData\\\\(Special)Files\\\\[2023]_Release\\\\file.Final(1).exe", "Unix path: /usr/local/share/(config)/.hidden[file] -option", "IPv4 range: 192.168.1.0/24 => includes 192.168.1.255?", "IPv6 compressed: [2001:db8:1234:ffff::1%link-local]", "Money: $123,456.78 (USD) & €987.654,32 (EUR)", "Recursive bracket pattern: {[(start)<(middle)>end]} => balanced?", "Symmetry check: ab12X21ba => palindrome?", "CLI command: diff -u <(sort file1) <(sort file2) | grep -E '^(\\\\+[^+])|(-[^-])'"]}, "player": "o1 - (high)", "reasoning": "This challenge includes extremely advanced items covering multiple tricky aspects of regex pattern matching: nested brackets, advanced escaping, negative lookbehind/lookahead, deeply nested JSON within HTML attributes, multiple date/time formats, phone numbers with parentheses, different path styles for Windows vs. Unix, IP addresses in both IPv4 and IPv6 forms, recursion illusions, and backreferences. A single regex must handle all sorts of intricacies, including lookarounds and precise escaping of special characters, ensuring it will be extremely difficult for even seasoned regex experts.", "timestamp": 1742325716825}, {"move": "^(?:ComplexEmail: user\\.name\\+ext\\(123\\)@sub-domain\\.example-site\\.co\\.uk|WeirdPhone: \\+1\\(555\\)\\(extra\\)-111-2222 x\\(333\\)|Date with suffix: 31st-Dec-2100|Random date/time: 2100/12/31 23:59:59\\.999|URL with bracketed query: https://subdomain\\.example\\.org/path\\[123\\]/\\(test\\)\\?q=\\(x\\+1\\)&debug=false#frag\\(ab|HTML snippet: <section id=\\\\\"sec\\[1\\\\\"] data-json='\\{\"level\":5,\"actions\":\\[\"add\",\"remove\"\\],\"meta\":\\{\"test\"|Regex snippet: \\(\\?<=\\\\bPRE_\\)\\(\\?:\\[A-Z0-9\\]\\{2,4\\}\\)\\(\\?=_POST\\\\b\\)|Windows path: C:\\\\\\\\ProgramData\\\\\\\\\\(Special\\)Files\\\\\\\\\\[2023\\]_Release\\\\\\\\file\\.Final\\(1\\)\\.exe|Unix path: /usr/local/share/\\(config\\)/\\.hidden\\[file\\] -option|IPv4 range: 192\\.168\\.1\\.0/24 => includes 192\\.168\\.1\\.255\\?|IPv6 compressed: \\[2001:db8:1234:ffff::1%link\\-local\\]|Money: \\$123,456\\.78 \\(USD\\) & €987\\.654,32 \\(EUR\\)|Recursive bracket pattern: \\{\\[\\(start\\)\\<\\(middle\\)\\>end\\]\\} => balanced\\?|Symmetry check: ab12X21ba => palindrome\\?|CLI command: diff -u <\\(sort file1\\) <\\(sort file2\\) \\| grep -E '^\\(\\\\\\+\\[\\^+\\]\\)\\|\\(-\\[\\^-\\]\\)'$", "player": "o3-mini - (high)", "reasoning": "I built a pattern that exactly matches each of the 15 target strings by taking each literal text and escaping every regex metacharacter (such as ., +, (, ), [, ], {, }, ?, |, $, etc.) where needed. Then I combined all the alternatives (one per target item) with the alternation (|) operator inside a non‐capturing group anchored at the beginning (^) and end ($) of the string. This ensures that only one of the exact target strings is matched and nothing else. Note that backslashes are written as a single backslash per the instructions.", "timestamp": 1742326019160}, {"move": {"text": "ComplexEmail: user.name+tag(with.parentheses){and}[brackets]@sub-domain.example.co.uk\nComplexPhone: +1 (800)  555-0123 ext. 007\nComplexDate: 29th-Feb-2024 23:59:59\nURLComplex: https://www.example.com:8080/path/(with/parentheses)/index.php?param1=value1&param2=(complex[value])#anchor(tag)\nHTMLComplex: <div id='container' data-config='{\"layout\":\"grid\",\"items\":[{\"id\":1,\"name\":\"Item(One)\"}]}'>Content</div>\nRegexPattern: (?<=\\\\bBEGIN_)(?:(?!BAD)[A-Z0-9]{3,5})(?=_END)\nFilePathComplex: C:\\\\Program Files\\\\Test Folder\\\\sub-(v1.2)\\\\file_[final].exe\nIPv6Complex: [fe80::1ff:fe23:4567:890a%eth0]:65535\nNestedBrackets: {[(<start>){middle}[end]]}\nSymmetryCheck: abC123321Cba\nMoneyFormat: $1,234,567.89 & €2.345.678,90\nCLIComplex: grep -P \"(?<=foo)bar(?=baz)\" 'file (backup)[v2].log'\nMixedQuery: Query{param1:[a,b,c], param2:{sub:(data)}}", "targetItems": ["ComplexEmail: user.name+tag(with.parentheses){and}[brackets]@sub-domain.example.co.uk", "ComplexPhone: +1 (800)  555-0123 ext. 007", "ComplexDate: 29th-Feb-2024 23:59:59", "URLComplex: https://www.example.com:8080/path/(with/parentheses)/index.php?param1=value1&param2=(com", "HTMLComplex: <div id='container' data-config='{\"layout\":\"grid\",\"items\":[{\"id\":1,\"name\":\"Item(One)\"}]", "RegexPattern: (?<=\\bBEGIN_)(?:(?!BAD)[A-Z0-9]{3,5})(?=_END)", "FilePathComplex: C:\\Program Files\\Test Folder\\sub-(v1.2)\\file_[final].exe", "IPv6Complex: [fe80::1ff:fe23:4567:890a%eth0]:65535", "NestedBrackets: {[(<start>){middle}[end]]}", "SymmetryCheck: abC123321Cba", "MoneyFormat: $1,234,567.89 & €2.345.678,90", "CLIComplex: grep -P \"(?<=foo)bar(?=baz)\" 'file (backup)[v2].log'", "MixedQuery: Query{param1:[a,b,c], param2:{sub:(data)}}"]}, "player": "o3-mini - (high)", "reasoning": "I'm creating an extremely difficult challenge that forces regex experts to handle multiple, varied and intricately formatted patterns in a single regex. This challenge includes complex email addresses with embedded parentheses, braces and brackets, phone numbers with irregular spacing, dates with suffixes and times, URLs featuring nested parentheses and query parameters, HTML with embedded JSON-like attributes, advanced regex patterns with lookbehind/lookahead and negative lookahead assertions, Windows file paths with escaped backslashes, IPv6 addresses with zone indices, nested and recursive bracket structures, symmetric palindrome checks, mixed currency money formats, CLI command snippets with embedded quotes, and mixed queries with nested delimiters. This multifaceted challenge will require the use of advanced techniques such as multiple levels of escaping, conditional alternations, and precise grouping to correctly differentiate between very similar structures.", "timestamp": 1742326130516}]