[{"move": {"text": "Emails: contact-us@domain.com, admin@site.edu.co, user.name@sub-domain.net. Dates: 2023/10/09, 09-10-2023, and 10.09.2023. Entities: &amp;, &#169;, &lt;, and &notambiguous;. IDs: A-123-B, CD-456-78, X-Y-Z, XX-21-ZZ.", "targetItems": ["contact-us@domain.com", "admin@site.edu.co", "user.name@sub-domain.net", "2023/10/09", "09-10-2023", "10.09.2023", "&amp;", "&#169;", "&lt;", "&notambiguous;", "A-123-B", "CD-456-78"]}, "player": "gpt-4o", "reasoning": "I'm crafting an extremely challenging regex exercise that blends diverse patterns such as email formats, encoded HTML entities, dates with varied separators, and negative lookahead for edge matches. This demands precise logic, lookarounds, and alternation.", "timestamp": 1742325146209}, {"move": "^(?:contact-us@domain\\.com|admin@site\\.edu\\.co|user\\.name@sub-domain\\.net|2023/10/09|09-10-2023|10\\.09\\.2023|&amp;|&#169;|&lt;|&notambiguous;|A-123-B|CD-456-78)$", "player": "o3-mini - (low)", "reasoning": "The target items are exactly 12 strings. Given that we must match exactly these items and nothing else, a simple approach is to use alternation inside a non-capturing group bounded by start (^) and end ($) anchors. Special characters that have meaning in regex (such as dot, dash, slash, and ampersand) should be escaped if necessary. I have escaped dots and slashes appropriately when they appear as literal characters in the strings. Each alternative is an exact literal match of the corresponding target item.", "timestamp": 1742325152213}, {"move": {"text": "Welcome to the ultimate regex challenge! Our key targets are buried within this mess. First, reach out at a_b-c.X9@sub.domain.com to connect. If you need urgent assistance, dial 987-654-3210 immediately. Remember to mark the event on 2023/10/09 14:55, and don’t forget our confidential identifier ID-A1B2C3-XYZ. Also, circle the new holiday on 2023-12-31. Finally, note the unique marker &special_entity_&#9731; amidst other decoys like &notvalid; and &fake_entity; that are just distractions.", "targetItems": ["a_b-c.X9@sub.domain.com", "987-654-3210", "2023/10/09 14:55", "ID-A1B2C3-XYZ", "2023-12-31", "&special_entity_&#9731;"]}, "player": "o3-mini - (low)", "reasoning": "I'm creating an extremely difficult challenge requiring the use of advanced regex techniques such as mixed formats (emails, phone numbers, dates with different separators), complex escapes for special characters, and patterns with backreferences or negative lookaheads. The text sample includes six challenging target items: an email with underscores and subdomains, a hyphenated phone number, a date with time following a specific format, a secret code resembling a pattern that may require backreferences, another date in a different format, and a concatenated HTML entity with a numeric code. This challenge is significantly more complex than previous challenges and will test the regex matcher thoroughly.", "timestamp": 1742325169350}, {"move": "^(?:a_b-c\\.X9@sub\\.domain\\.com|987-654-3210|2023/10/09 14:55|ID-A1B2C3-XYZ|2023-12-31|&special_entity_&#9731;)$", "player": "gpt-4o", "reasoning": "This pattern matches each target precisely by isolating their unique structures: an email with special characters, a phone number with dashes, a datetime with a specific format, an alphanumeric identifier with hyphens, a date with hyphens, and a combined entity with special symbols. Each portion is matched such that no other text from the provided input satisfies the pattern.", "timestamp": 1742325175320}, {"move": {"text": "Emails: max@data-base.io, alpha.beta@generic-site.org.uk, \"complicated@sample-domain.edu\" (quoted). Dates: 2023/11/11, 11-11-2023, November 11, 2023, 20231111. Codes: X-999-ZXY, QW-88-P, H.500-E.T. HTML entities: &delta;, &epsilon;, &#9731;, &notexist;. Tricky cases: John_33&co@example-site..com, \"mis@match@domain.co.in\", short@.dk", "targetItems": ["max@data-base.io", "alpha.beta@generic-site.org.uk", "\"complicated@sample-domain.edu\"", "2023/11/11", "11-11-2023", "November 11, 2023", "20231111", "X-999-ZXY", "QW-88-P", "H.500-E.T", "&delta;", "&epsilon;", "&#9731;", "&notexist;"]}, "player": "gpt-4o", "reasoning": "I'm creating an extremely difficult challenge that requires advanced regex techniques, including handling variable whitespace, escaping special characters, matching nested or optional subpatterns, and combining lookahead/lookbehind logic.", "timestamp": 1742325183649}, {"move": "^(?:max@data-base\\.io|alpha\\.beta@generic-site\\.org\\.uk|\"complicated@sample-domain\\.edu\"|2023/11/11|11-11-2023|November 11, 2023|20231111|X-999-ZXY|QW-88-P|H\\.500-E\\.T|&delta;|&epsilon;|&#9731;|&notexist;)$", "player": "o3-mini - (low)", "reasoning": "The goal is to construct a regex that exactly matches one of the 14 target strings exactly as they appear, with no extra characters. I enclosed all target strings in a non-capturing group with alternation and anchored the pattern from beginning (^) to end ($). Inside each alternative, literal characters that have special meaning in regex (such as dot '.') are escaped as needed. For example, in email addresses, dots are escaped so that they match only a literal dot. Likewise, in the quoted email string, the double quotes are provided in the pattern. This regex will match exactly one of the 14 complete target items, and will not match any other text from the challenge description. No unnecessary escapes are included and the pattern is a valid JavaScript regular expression (without the leading or trailing slashes/flags).", "timestamp": 1742325197149}, {"move": {"text": "Challenge Items: complex.email+filter@sub.domain-example.com; +1 (234) 567-8901; 2020/02/29; 02-29-2020; 29.02.2020; AB-99-AB; \"quoted.email@domain.org\"; &long_entity_NAME;", "targetItems": ["complex.email+filter@sub.domain-example.com", "+1 (234) 567-8901", "2020/02/29", "02-29-2020", "29.02.2020", "AB-99-AB", "\"quoted.email@domain.org\"", "&long_entity_NAME;"]}, "player": "o3-mini - (low)", "reasoning": "I'm creating an extremely difficult challenge that incorporates a variety of complex patterns requiring advanced regex techniques. The text sample includes: 1) an email with a plus filter and subdomains requiring special character escaping, 2) an international-format phone number with optional plus sign, spaces, and parentheses, 3) three date formats for February 29 in a leap year with different separators, 4) a pattern with a repeated two-letter block with a two-digit number in between (requiring backreferences), 5) a quoted email enclosed in double quotes, and 6) an HTML-like entity with a long, mixed-case name. This challenge will test handling of complex alternations, grouping, escaping, optional components, and backreferences in one regex pattern.", "timestamp": 1742325204732}, {"move": "^(?:complex\\.email\\+filter@sub\\.domain-example\\.com|\\+1 \\(234\\) 567-8901|2020/02/29|02-29-2020|29\\.02\\.2020|AB-99-AB|\\\"quoted\\.email@domain\\.org\\\"|&long_entity_NAME;)$", "player": "gpt-4o", "reasoning": "This pattern is designed to match all the target items exactly and only those items. I carefully included specific escapes for special characters where required, such as periods, double quotes, and parentheses. Each item is alternated using the non-capturing group syntax '?:', ensuring that each is matched individually against the provided list. The pattern should work as intended for all given items.", "timestamp": 1742325211775}, {"move": {"text": "Emails: john.doe+tag@example.co.uk, \"weird.@email\"@complex-domain.io, user_123@sub.domain.com. Dates: 2024/03/31, 29-Feb-2024, Apr 15th, 2024, 04.2024. Entities: &complex_entity_1;, &#9829;, &new;char. Numbers: +44 (123) 456-7890, 123.456.7890x123, (555)123-4567.", "targetItems": ["john.doe+tag@example.co.uk", "\"weird.@email\"@complex-domain.io", "user_123@sub.domain.com", "2024/03/31", "29-Feb-2024", "Apr 15th, 2024", "04.2024", "&complex_entity_1;", "&#9829;", "&new;char", "+44 (123) 456-7890", "123.456.7890x123", "(555)123-4567"]}, "player": "gpt-4o", "reasoning": "I'm creating an extremely difficult challenge requiring complex pattern matching that incorporates nested special characters, optional sections, lookaheads/lookbehinds, and mixed patterns requiring precise escaping and alternation.", "timestamp": 1742325223671}, {"move": "^(?:john\\.doe\\+tag@example\\.co\\.uk|\"weird\\.@email\"@complex-domain\\.io|user_123@sub\\.domain\\.com|2024/03/31|29-Feb-2024|Apr 15th, 2024|04\\.2024|&complex_entity_1;|&#9829;|&new;char|\\+44 \\(123\\) 456-7890|123\\.456\\.7890x123|\\(555\\)123-4567)$", "player": "o3-mini - (low)", "reasoning": "The pattern is built as a non-capturing group that matches exactly one of the 13 target strings given in the game text, using correct escaping for dots, plus signs, parentheses, and other special characters. Each target item appears exactly as provided and in the correct order inside the alternation in the non-capturing group. This ensures that the regex only matches the given target items and nothing else.", "timestamp": 1742325229418}, {"move": {"text": "Here is the mixed content challenge: Our system logs various inputs. Emails observed include alpha.beta+gamma_delta@sub-domain.example.co.uk and \"quoted.email+test@sample-domain.edu\". Important dates are logged as 31/12/2023, 2023-12-31, and Dec 31, 2023, all representing the end of the year. For communications, call +1 (800) 555-0199 was made, and another record shows 800-555-0199 ext.123. Color codes like #A3F9B2 are sometimes used in design records. Our ID tags follow the format where the letter groups are identical, for instance, BB-456-BB. HTML content might contain entities such as &complexEntityName_123;, but note that similar sequences like NotValid&entity; should not be matched. Lastly, verify that spaced@example.com appears correctly, with no surrounding whitespace. End of record.", "targetItems": ["alpha.beta+gamma_delta@sub-domain.example.co.uk", "\"quoted.email+test@sample-domain.edu\"", "31/12/2023", "2023-12-31", "Dec 31, 2023", "+1 (800) 555-0199", "800-555-0199 ext.123", "#A3F9B2", "BB-456-BB", "&complexEntityName_123;", "spaced@example.com"]}, "player": "o3-mini - (low)", "reasoning": "I'm creating an extremely difficult challenge that combines multiple advanced regex techniques in a single regex. The sample includes advanced email formats with plus signs and underscores, quoted emails, mixed date formats with various separators (slashes, dashes, and textual month representations), phone numbers with and without extensions, a hex color code, a pattern with a backreference requirement (identical letter groups), HTML entities with underscores, and an email with leading/trailing spaces trimmed. Additionally, a non-target distractor is included to ensure that naive patterns might capture extra items. This challenge forces contestants to use careful escaping, anchoring, lookaheads/lookbehinds, and backreferences, making it significantly harder than previous tasks.", "timestamp": 1742325246308}, {"move": "^(?:alpha\\.beta\\+gamma_delta@sub-domain\\.example\\.co\\.uk|\"quoted\\.email\\+test@sample-domain\\.edu\"|31/12/2023|2023-12-31|Dec 31, 2023|\\+1 \\(800\\) 555-0199|800-555-0199 ext\\.123|#A3F9B2|BB-456-BB|&complexEntityName_123;|spaced@example\\.com)$", "player": "gpt-4o", "reasoning": "To ensure I match only the listed target items from the provided text and nothing else, I constructed the regex pattern by explicitly writing out each item separated by the non-capturing group \"(?:...)\". Each email, date, phone number, entity, and code is escaped properly as needed. I took every special character into account and did not include any unnecessary matches of non-target items while respecting the order of appearance in the text.", "timestamp": 1742325253898}, {"move": {"text": "List of critical entries: \"jane\\\"doe\"@domain-extra.edu, john\\\\smith@work-site.net, date: 2024-02-29, alt-date: (29/02/2024), 2/29/2024, hexcode: #FF5733, #123abc, full color: rgba(255, 99, 71, 0.5), mobile: +44 123 4567 8901 ext123, alt-phone: (123) 456-7890x23, special entity: &lt;alpha&gt;, &not-elementary;, ending sequences: [ID:ZXY-123-X57], prefix-*ID=99-BETA_!!]", "targetItems": ["\"jane\\\"doe\"@domain-extra.edu", "john\\\\smith@work-site.net", "2024-02-29", "(29/02/2024)", "2/29/2024", "#FF5733", "#123abc", "rgba(255, 99, 71, 0.5)", "+44 123 4567 8901 ext123", "(123) 456-7890x23", "&lt;alpha&gt;", "&not-elementary;", "[ID:ZXY-123-X57]", "prefix-*ID=99-BETA_!!"]}, "player": "gpt-4o", "reasoning": "I'm proposing this challenge as it includes a mix of complex patterns requiring advanced regex techniques. Several patterns involve optional components, lookaheads, lookbehinds, and escaping special characters. This set includes dates with format variations, obfuscated email addresses requiring nested backslashes, hex color codes, special characters, and tricky phone formats with variable whitespace or extensions. The mixture of these advanced and diverse patterns makes the task significantly more difficult.", "timestamp": 1742325266840}, {"move": "^(?:\"jane\\\\\\\"doe\"@domain-extra\\.edu|john\\\\\\\\smith@work-site\\.net|2024-02-29|\\(29/02/2024\\)|2/29/2024|#FF5733|#123abc|rgba\\(255, 99, 71, 0\\.5\\)|\\+44 123 4567 8901 ext123|\\(123\\) 456-7890x23|&lt;alpha&gt;|&not-elementary;|\\[ID:ZXY-123-X57\\]|prefix-\\*ID=99-BETA_!!)$", "player": "o3-mini - (low)", "reasoning": "The idea is to exactly match each target string and nothing else. I used a non‐capturing group with alternatives (?: ... ) containing each literal string. All characters that have special meaning in regex (like dot, parentheses, plus, asterisk, etc.) are escaped so that they match their literal values. For example, in the email \"jane\\\"doe\"@domain-extra.edu the backslash that appears in the text is matched by \\\\ in the pattern. The same is done for phone numbers, dates, and entities. This guarantees that only and exactly the 14 target items are matched in the given text.  ", "timestamp": 1742325281483}, {"move": {"text": "Item1: complex.email+filter\\\"test\\\"@example-domain.com\nItem2: +1 (800) 555-2299 ext.456\nItem3: Feb 29, 2024\nItem4: 2024-02-29\nItem5: #ABCdef\nItem6: ID-AB12-12AB\nItem7: a_b-c.123@example.io\nItem8: &custom_entity_42;", "targetItems": ["complex.email+filter\\\"test\\\"@example-domain.com", "+1 (800) 555-2299 ext.456", "Feb 29, 2024", "2024-02-29", "#ABCdef", "ID-AB12-12AB", "a_b-c.123@example.io", "&custom_entity_42;"]}, "player": "o3-mini - (low)", "reasoning": "I'm creating an extremely challenging regex matching exercise that involves multiple complex patterns including advanced email formats with embedded quotes, international phone numbers with extensions, multiple date formats (textual and numeric), hexadecimal color codes with character class restrictions, complex identifiers with alternating letter-digit sequences, and HTML entities with underscores and numbers. This challenge requires advanced techniques such as proper escaping, handling optional components, and differentiating between closely similar but non-matching strings using negative lookahead if necessary. The items are designed to force participants to use all advanced regex techniques in a single pattern.", "timestamp": 1742325291421}, {"move": "^(?:complex\\.email\\+filter\\\\\\\"test\\\\\\\"@example-domain\\.com|\\+1 \\(800\\) 555-2299 ext\\.456|Feb 29, 2024|2024-02-29|#ABCdef|ID-AB12-12AB|a_b-c\\.123@example\\.io|&custom_entity_42;)$", "player": "gpt-4o", "reasoning": "The provided list of target items contains special characters such as quotes, backslashes, colons, and symbols that need escaping. To ensure the regex matches these exact strings and nothing else, I use a non-capturing group (?:...) and separate each item with '|'. Each special character is properly escaped to prevent misinterpretation by the regex engine, such as backslashes being escaped as '\\\\' and double quotes as '\"'. Items like parentheses, plus signs, and dots are similarly escaped. Since the regex needs to match the exact strings in the provided text, I anchor the start (^) and end ($) of the expression to ensure there are no partial matches.", "timestamp": 1742325298554}, {"move": {"text": "Emails: \"name.with\\\"quotes\\\"@weird-site.org\" , normal+plus@subdomain.domain.net , _underscore123@local.dev . Dates: 31-02-2000, 02/30/2023 (Invalid), 29-Feb-2024 (Valid), date 31/12/24 (short format). Colors: #FF5733,#C0FFEE, (An invalid one too: #1234!!). Phone Numbers: +1-800-123-4567x456, 18001234567 ext 123, (+44)-555-667-8910 (Intl). Text Entities: &notAreal-entity123;, &[custom_!@#];, &gt;text&lt; . IDs: ID-9999-ABCDXYZ , X-12345-&& , QUOTE-ID:\"AB_55-6#\" . Nested items: (outside(inside(inner)))", "targetItems": ["\"name.with\\\"quotes\\\"@weird-site.org\"", "normal+plus@subdomain.domain.net", "_underscore123@local.dev", "29-Feb-2024", "date 31/12/24", "31-02-2000", "02/30/2023", "#FF5733", "#C0FFEE", "&notAreal-entity123;", "&[custom_!@#];", "ID-9999-ABCDXYZ", "QUOTE-ID:\\\"AB_55-6#\\\"", "(+44)-555-667-8910", "(+44)-555-667-8910", "18001234567 ext 123", "(+1)-800-123-4567x456", "&gt;text&lt;", "(outside(inside(inner)))"]}, "player": "gpt-4o", "reasoning": "I'm crafting a tremendously difficult regex challenge by combining diverse, overlapping, and advanced formats such as nested quotes, escaped backslashes, negative lookaheads for exclusions, varying date layouts, phone numbers with optional extensions, hexadecimal codes with specific character restrictions, and custom entities with mixed formats. This will push the limits of regex matching due to intricate edge cases and multiple patterns merged into a single regex.", "timestamp": 1742325415866}]