{"comments":[{"comment":{"id":12452420,"creator_id":1811,"post_id":14681285,"content":"The answer given in the spoiler tag is not quite correct!\n\n::: spoiler Test case\nAccording to the spoiler, this shouldn't match \"abab\", but it does.\n:::\n\n::: spoiler Corrected regex\nThis will match what the spoiler says: `^.?$|^((.)\\2+?)\\1+$`\n:::\n\n::: spoiler Full workup\nAny Perl-compatible regex can be parsed into a syntax tree using the Common Lisp package [CL-PPCRE](https://edicl.github.io/cl-ppcre/). So if you already know Common Lisp, you don't need to learn regex syntax too!\n\nSo let's put the original regex into CL-PPCRE's parser. (Note, we have to add a backslash to escape the backslash in the string.) The parser will turn the regex notation into a nice pretty S-expression.\n\n```\n> (cl-ppcre:parse-string \"^.?$|^(..+?)\\\\1+$\")\n(:ALTERNATION\n (:SEQUENCE :START-ANCHOR (:GREEDY-REPETITION 0 1 :EVERYTHING) :END-ANCHOR)\n (:SEQUENCE :START-ANCHOR\n (:REGISTER\n (:SEQUENCE :EVERYTHING (:NON-GREEDY-REPETITION 1 NIL :EVERYTHING)))\n (:GREEDY-REPETITION 1 NIL (:BACK-REFERENCE 1)) :END-ANCHOR))\n```\n\nAt which point we can tell it's tricky because there's a capturing register using a non-greedy repetition. (That's the `\\1` and the `+?` in the original.)\n\nThe top level is an alternation (the `|` in the original) and the first branch is pretty simple: it's just zero or one of any character.\n\nThe second branch is the fun one. It's looking for two or more repetitions of the captured group, which is itself two or more characters. So, for instance, \"aaaa\", or \"abcabc\", or \"abbaabba\", but not \"aaaaa\" or \"abba\".\n\nSo strings that this matches will be of non-prime length: zero, one, or a multiple of two numbers 2 or greater.\n\nBut it is not true that it matches *only* \"any character repeated a non-prime number of times\" because it also matches composite-length sequences formed by repeating a string of *different* characters, like \"abcabc\".\n\nIf we actually want what the spoiler says — only non-prime repetitions of a single character — then we need to use a second capturing register inside the first. This gives us:\n\n`^.?$|^((.)\\2+?)\\1+$`.\n\nSpecifically, this replaces `(..+?)` with `((.)\\2+?)`. The `\\2` matches the character captured by `(.)`, so the whole regex now needs to see the same character throughout.\n:::\n","removed":false,"published":"2024-10-31T04:46:35.896788Z","updated":"2024-10-31T16:32:21.359502Z","deleted":false,"ap_id":"https://lemmy.world/comment/13181865","local":false,"path":"0.12452420","distinguished":false,"language_id":0},"creator":{"id":1811,"name":"fubo","banned":false,"published":"2023-06-09T03:22:34.754958Z","actor_id":"https://lemmy.world/u/fubo","bio":"No relation to the sports channel.","local":false,"deleted":false,"bot_account":false,"ban_expires":"2023-12-05T06:02:27Z","instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12452420,"score":137,"upvotes":137,"downvotes":0,"published":"2024-10-31T04:46:35.896788Z","child_count":17},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12455542,"creator_id":5113693,"post_id":14681285,"content":"Relevant [xkcd](https://xkcd.com/1171/):\n\n\n![](https://lemmus.org/pictrs/image/2c9114d7-bd65-492d-b124-760bf60532ba.webp)","removed":false,"published":"2024-10-31T08:49:58.859505Z","deleted":false,"ap_id":"https://lemmus.org/comment/8805865","local":false,"path":"0.12455542","distinguished":false,"language_id":37},"creator":{"id":5113693,"name":"sundray","display_name":"Sundray","avatar":"https://lemmus.org/pictrs/image/9c21afcd-2b5a-4a02-b885-92e03c8fb22a.webp","banned":false,"published":"2023-12-19T19:29:47.072423Z","actor_id":"https://lemmus.org/u/sundray","bio":"Just a 'lil guy on the web. Also on Mastodon: [@sundray@mastodon.social](https://mastodon.social/users/sundray) and [Pixey](https://pixey.org/i/web/profile/756775784847436272)\n\n(Crossposting OK!)","local":false,"deleted":false,"bot_account":false,"instance_id":864},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12451169,"score":44,"upvotes":45,"downvotes":1,"published":"2024-10-31T03:01:31.516166Z","child_count":2},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12460062,"creator_id":1704,"post_id":14681285,"content":"knowing Matt Parker it only matches prime numbers or multiples of e or something.\n\n*looks at <ansewer>*\n\nYeah see?","removed":false,"published":"2024-10-31T13:32:46.087995Z","deleted":false,"ap_id":"https://sh.itjust.works/comment/14760623","local":false,"path":"0.12460062","distinguished":false,"language_id":37},"creator":{"id":1704,"name":"captain_aggravated","display_name":"Captain Aggravated","avatar":"https://sh.itjust.works/pictrs/image/4912a506-a99f-4779-a5f9-3d3d63822215.jpeg","banned":false,"published":"2023-06-20T01:23:45.732166Z","actor_id":"https://sh.itjust.works/u/captain_aggravated","bio":"Linux gamer, retired aviator, profanity enthusiast","local":false,"deleted":false,"bot_account":false,"instance_id":32},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12460062,"score":41,"upvotes":41,"downvotes":0,"published":"2024-10-31T13:32:46.087995Z","child_count":1},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12460077,"creator_id":10165206,"post_id":14681285,"content":"So, here's my attempt\n\nThe first portion (`^.?$`) matches all lines of 0 or 1 characters.\n\nThe second portion (`^(..+?)\\1+$`) is more complicated:\n\n1. `(..+?)` is a capture group that matches the first character in any line, followed by a smallest possible non-zero number of characters such that (2) still matches (**note** that the minimum length of this match is 2)\n2. `\\1+` matches as many as possible (and **more than 0**) repeats of the (1) group\n\nI _think_ what this does is match any line consisting of a single character with the length\n\n- divisible by some number (due to the **more than 0** condition in (2), so that there have to be repeats in the string), that's not \n * `1` (due to the **note** in (1), so that the repeating portion has to be at least 2 characters long), or \n * the length itself (due to the **more than 0** condition in the (2), so that there is at least one repetition)\n\nTherefore, combined with the first portion, it matches all lines of the same character whose lengths are composite (non-prime) numbers? (it will also match any line of length 1, and all lines consisting of the same string repeated more than one time)","removed":false,"published":"2024-10-31T13:33:44.780259Z","updated":"2024-10-31T13:36:07.151256Z","deleted":false,"ap_id":"https://lemmy.ml/comment/14641183","local":false,"path":"0.12460077","distinguished":false,"language_id":37},"creator":{"id":10165206,"name":"balsoft","banned":false,"published":"2024-06-10T15:57:14.019993Z","actor_id":"https://lemmy.ml/u/balsoft","local":false,"deleted":false,"matrix_user_id":"@balsoft:balsoft.ru","bot_account":false,"instance_id":16},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12451423,"score":17,"upvotes":17,"downvotes":0,"published":"2024-10-31T03:19:34.280885Z","child_count":0},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12458191,"creator_id":9560284,"post_id":14681285,"content":"I'm going to assume the answer is a magic square attempt that just isn't very good","removed":false,"published":"2024-10-31T11:48:45.613467Z","deleted":false,"ap_id":"https://lemmy.ml/comment/14639464","local":false,"path":"0.12458191","distinguished":false,"language_id":37},"creator":{"id":9560284,"name":"ShinkanTrain","banned":false,"published":"2024-06-13T14:21:16.674444Z","actor_id":"https://lemmy.ml/u/ShinkanTrain","bio":"he/they","local":false,"deleted":false,"bot_account":false,"instance_id":16},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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It looks like the string of characters could repeat number of times because the whole capture group repeats. I don't see a prime constraint.","removed":false,"published":"2024-10-31T12:58:27.627700Z","deleted":false,"ap_id":"https://lemmy.world/comment/13187542","local":false,"path":"0.12459414","distinguished":false,"language_id":0},"creator":{"id":11048534,"name":"nroth","banned":false,"published":"2024-08-09T23:07:42.591409Z","actor_id":"https://lemmy.world/u/nroth","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12459414,"score":12,"upvotes":12,"downvotes":0,"published":"2024-10-31T12:58:27.627700Z","child_count":1},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12459707,"creator_id":1349063,"post_id":14681285,"content":"This is brilliantly disgusting.\n::: spoiler Literal interpretation of the regex\nThe regex matches either a line with a single character or a line with a sequence of two or more characters that's repeated two or more times. For some examples: the regex matches \"a\", \"b\", \"abab\", \"ababab\", \"aaaa\", and \"bbbbbb\", but does not match \"aa\", \"bb\", \"aaa\", \"ab\", \"aba\", or \"ababa\".\n:::\n::: spoiler Hint for the special thing it matches\nFor a line with a single character repeated *_n_* times, what does matching (or not matching) this regex say about the number *_n_*?\n:::","removed":false,"published":"2024-10-31T13:14:36.599557Z","deleted":false,"ap_id":"https://lemmy.ml/comment/14640824","local":false,"path":"0.12459707","distinguished":false,"language_id":0},"creator":{"id":1349063,"name":"fysihcyst","banned":false,"published":"2023-08-04T02:57:35.832498Z","actor_id":"https://lemmy.ml/u/fysihcyst","local":false,"deleted":false,"bot_account":false,"instance_id":16},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12459707,"score":7,"upvotes":7,"downvotes":0,"published":"2024-10-31T13:14:36.599557Z","child_count":1},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12458064,"creator_id":3100108,"post_id":14681285,"content":"No cookie for me I just tried it in Notepad++ and VS code and it matches lines of one characer (first group I think) or the starting of a line that is an at least 2 characters string repeated twice (second group it seems) \nso the second group matches \nabab \nabcabc \nabcdeabce \nabcdefabcdef \n \nNothing about prime numbers really only first repetition gets a match. Very interesting Honestly I used regex from years and never had to retort to something like this ever.\nI can only imagine it useful to check for a password complexity to not be repeated strings like I do for sites that I just want in and use a yopmail.com mail to register a fake user.\n","removed":false,"published":"2024-10-31T11:41:02.641884Z","deleted":false,"ap_id":"https://lemmy.dbzer0.com/comment/14428383","local":false,"path":"0.12458064","distinguished":false,"language_id":0},"creator":{"id":3100108,"name":"S_H_K","banned":false,"published":"2023-10-09T23:00:09.807699Z","actor_id":"https://lemmy.dbzer0.com/u/S_H_K","local":false,"deleted":false,"bot_account":false,"instance_id":65},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12489063,"score":4,"upvotes":4,"downvotes":0,"published":"2024-11-01T18:28:34.210156Z","child_count":0},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12464622,"creator_id":5567465,"post_id":14681285,"content":"I could be wrong but I think the `(..+?)` portion will either remove a dud or replenish the allowance.","removed":false,"published":"2024-10-31T17:06:02.053029Z","updated":"2024-11-01T02:16:49.534711Z","deleted":false,"ap_id":"https://lemmy.world/comment/13191720","local":false,"path":"0.12464622","distinguished":false,"language_id":0},"creator":{"id":5567465,"name":"SpiceDealer","avatar":"https://lemmy.world/pictrs/image/4503b26c-9548-4239-aa93-fb1df641f7e5.jpeg","banned":false,"published":"2024-01-08T05:08:23.708047Z","actor_id":"https://lemmy.world/u/SpiceDealer","bio":"The Universe's greatest distributor of Spice. Cult of the Shrike member.","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12464622,"score":4,"upvotes":4,"downvotes":0,"published":"2024-10-31T17:06:02.053029Z","child_count":0},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12459786,"creator_id":126229,"post_id":14681285,"content":"Is there a reason to use `(..+?)` instead of `(.+)` ?","removed":false,"published":"2024-10-31T13:17:17.171883Z","deleted":false,"ap_id":"https://lemmy.world/comment/13187825","local":false,"path":"0.12459786","distinguished":false,"language_id":37},"creator":{"id":126229,"name":"Feathercrown","banned":false,"published":"2023-07-06T16:55:51.420200Z","actor_id":"https://lemmy.world/u/Feathercrown","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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It's really the best thing that ever happened to regex.)","removed":false,"published":"2024-10-31T07:10:50.575217Z","updated":"2024-10-31T07:13:57.706556Z","deleted":false,"ap_id":"https://lemmy.world/comment/13183272","local":false,"path":"0.12452420.12453427.12454200","distinguished":false,"language_id":0},"creator":{"id":1811,"name":"fubo","banned":false,"published":"2023-06-09T03:22:34.754958Z","actor_id":"https://lemmy.world/u/fubo","bio":"No relation to the sports channel.","local":false,"deleted":false,"bot_account":false,"ban_expires":"2023-12-05T06:02:27Z","instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. 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If all your server logs are in lightly-structured text files on a small number of servers, being able to improvise regex is damn useful for tracking down server problems. Just write a shell loop that spawns an `ssh` logging into each server and running `grep` over the log files, to look for that weird error.\n\nThese days, if you need to crunch production server logs you probably need to improvise in SQL and `jq` and protobufs or systemd assmonkery or something.\n\nBut if you actually need a *parser*, for goodness sake use a parser combinator toolkit, don't roll your own, especially not with regex. Describing your input language in plain Haskell is much nicer than kludging it.\n\n(This is the \"totally serious software engineering advice\" forum, right?)","removed":false,"published":"2024-10-31T08:12:30.846554Z","deleted":false,"ap_id":"https://lemmy.world/comment/13183846","local":false,"path":"0.12452420.12454613.12455024","distinguished":false,"language_id":0},"creator":{"id":1811,"name":"fubo","banned":false,"published":"2023-06-09T03:22:34.754958Z","actor_id":"https://lemmy.world/u/fubo","bio":"No relation to the sports channel.","local":false,"deleted":false,"bot_account":false,"ban_expires":"2023-12-05T06:02:27Z","instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. 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","removed":false,"published":"2024-10-31T15:41:57.477567Z","updated":"2024-10-31T15:42:29.750687Z","deleted":false,"ap_id":"https://lemmy.world/comment/13190196","local":false,"path":"0.12452420.12456836.12462640","distinguished":false,"language_id":0},"creator":{"id":1811,"name":"fubo","banned":false,"published":"2023-06-09T03:22:34.754958Z","actor_id":"https://lemmy.world/u/fubo","bio":"No relation to the sports channel.","local":false,"deleted":false,"bot_account":false,"ban_expires":"2023-12-05T06:02:27Z","instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. 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There is another guy who got it right it seems.","removed":false,"published":"2024-11-01T02:08:38.721509Z","deleted":false,"ap_id":"https://lemmy.dbzer0.com/comment/14444872","local":false,"path":"0.12458064.12462094.12474202","distinguished":false,"language_id":0},"creator":{"id":3100108,"name":"S_H_K","banned":false,"published":"2023-10-09T23:00:09.807699Z","actor_id":"https://lemmy.dbzer0.com/u/S_H_K","local":false,"deleted":false,"bot_account":false,"instance_id":65},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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","removed":false,"published":"2024-10-31T13:15:21.443558Z","deleted":false,"ap_id":"https://lemmy.world/comment/13187804","local":false,"path":"0.12458423.12459744","distinguished":false,"language_id":0},"creator":{"id":768884,"name":"BluesF","banned":false,"published":"2023-07-28T06:34:22.552019Z","actor_id":"https://lemmy.world/u/BluesF","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12459744,"score":6,"upvotes":6,"downvotes":0,"published":"2024-10-31T13:15:21.443558Z","child_count":1},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12461860,"creator_id":388156,"post_id":14681285,"content":"That sounds…\n\nEasier to get _almost right_ than actually learning the subject.\n\nMuch, much harder to get _completely right_ than actually learning the subject.\n\nSo yes, basically the archetypal use case for LLMs.","removed":false,"published":"2024-10-31T15:03:30.435448Z","deleted":false,"ap_id":"https://midwest.social/comment/13231659","local":false,"path":"0.12458423.12461860","distinguished":false,"language_id":37},"creator":{"id":388156,"name":"kibiz0r","banned":false,"published":"2023-07-14T15:36:53.712441Z","actor_id":"https://midwest.social/u/kibiz0r","local":false,"deleted":false,"bot_account":false,"instance_id":11},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12461860,"score":3,"upvotes":3,"downvotes":0,"published":"2024-10-31T15:03:30.435448Z","child_count":0},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12460194,"creator_id":1762360,"post_id":14681285,"content":"I've never had to use it for important stuff tbh. But alongside a regex tester and a sample of the stuff I intend to use it on, I've had good results with an incremental approach where I tell the LLM what I want to change with the expression until I'm satisfied","removed":false,"published":"2024-10-31T13:38:37.338954Z","deleted":false,"ap_id":"https://lemmy.world/comment/13188174","local":false,"path":"0.12458423.12459744.12460194","distinguished":false,"language_id":0},"creator":{"id":1762360,"name":"Sylvartas","banned":false,"published":"2023-08-27T09:04:16.418552Z","actor_id":"https://lemmy.world/u/Sylvartas","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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So X groups of Y characters = string of length X*Y. X and Y can be anything so any string length that can be made by multiplying two numbers-- which is every non-prime string length-- is matched. 0 and 1 are handled specially at the start.","removed":false,"published":"2024-10-31T13:19:51.288752Z","deleted":false,"ap_id":"https://lemmy.world/comment/13187863","local":false,"path":"0.12459414.12459829","distinguished":false,"language_id":37},"creator":{"id":126229,"name":"Feathercrown","banned":false,"published":"2023-07-06T16:55:51.420200Z","actor_id":"https://lemmy.world/u/Feathercrown","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12459829,"score":4,"upvotes":4,"downvotes":0,"published":"2024-10-31T13:19:51.288752Z","child_count":0},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12459782,"creator_id":6032692,"post_id":14681285,"content":"You forgot empty line. Since first part is `^.?$` it's one or zero of any character. ","removed":false,"published":"2024-10-31T13:16:59.355508Z","deleted":false,"ap_id":"https://lemmy.world/comment/13187820","local":false,"path":"0.12459707.12459782","distinguished":false,"language_id":0},"creator":{"id":6032692,"name":"thevoidzero","banned":false,"published":"2024-01-25T20:20:44.635398Z","actor_id":"https://lemmy.world/u/thevoidzero","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. 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Also the +? is a lazy quantifier so it will consume as little as possible.","removed":false,"published":"2024-10-31T14:06:39.409321Z","deleted":false,"ap_id":"https://midwest.social/comment/13230634","local":false,"path":"0.12459786.12460731","distinguished":false,"language_id":0},"creator":{"id":1580520,"name":"explore_broaden","banned":false,"published":"2023-08-20T15:06:03.482295Z","actor_id":"https://midwest.social/u/explore_broaden","local":false,"deleted":false,"bot_account":false,"instance_id":11},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I really don't think there's any finite state machine that can track every possible number of string repeats separately.","removed":false,"published":"2024-10-31T15:57:26.384408Z","deleted":false,"ap_id":"https://lemmy.sdf.org/comment/15420159","local":false,"path":"0.12460077.12463002","distinguished":false,"language_id":0},"creator":{"id":1136,"name":"CanadaPlus","banned":false,"published":"2023-06-12T14:51:04.128599Z","actor_id":"https://lemmy.sdf.org/u/CanadaPlus","bio":"Formerly u/CanadaPlus101 on Reddit.","local":false,"deleted":false,"bot_account":false,"instance_id":9},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! (Or just rant about your favourite programming language.)\n\n# Rules:\n\n* Posts must be relevant to programming, programmers, or computer science.\n* No NSFW content.\n* Jokes must be in good taste. No hate speech, bigotry, etc.","removed":false,"published":"2019-08-19T09:46:48.488224Z","updated":"2022-03-08T19:55:12.303424Z","deleted":false,"nsfw":false,"actor_id":"https://lemmy.ml/c/programmerhumor","local":false,"icon":"https://lemmy.ml/pictrs/image/c0ed0a36-2496-4b4d-ac77-7d2fd7f2b5b7.png","banner":"https://lemmy.ml/pictrs/image/dd918f22-84fa-48d5-975a-c94981058c18.jpeg","hidden":false,"posting_restricted_to_mods":false,"instance_id":16,"visibility":"Public"},"counts":{"comment_id":12463002,"score":24,"upvotes":25,"downvotes":1,"published":"2024-10-31T15:57:26.384408Z","child_count":7},"creator_banned_from_community":false,"banned_from_community":false,"creator_is_moderator":false,"creator_is_admin":false,"subscribed":"NotSubscribed","saved":false,"creator_blocked":false},{"comment":{"id":12464464,"creator_id":3492260,"post_id":14681285,"content":"You got downvoted here but you're absolutely right. It's easy to prove that the set of strings with prime length is not a regular language using the pumping lemma for regular languages. And in typical StackExchange fashion, [someone's already done it](https://math.stackexchange.com/questions/4813128/proving-that-a-language-whose-strings-have-prime-length-is-not-context-free).\n\nHere's their proof.\n\nClaim 1: The language consisting of the character `1` repeated a prime number of times is not regular.\n\n![](https://lemmy.world/pictrs/image/f8b304ee-150b-43f0-adf9-3a9565c425cf.jpeg)\n\nA further argument to justify your claim—\n\nClaim 2: If the language described in Claim 1 is not regular, then the language consisting of the character `1` repeated a composite number of times is not regular.\n\nProof: Suppose the language described in Claim 2 is regular if the language described in Claim 1 is not. Then there must exist a finite-state automaton *A* that recognises it. If we create a new finite-state automaton B which (1) checks whether the string has length 1 and rejects it, and (2) then passes the string to automaton A and rejects when automaton A accepts and accepts when automaton A rejects, then we can see that automaton B accepts the set of all strings of non-composite length that are not of length 1, i.e. the set of all strings of prime length. But since the language consisting of all strings of prime length is non-regular, there cannot exist such an automaton. Therefore, the assumption that the language described in Claim 2 being regular is false.","removed":false,"published":"2024-10-31T17:00:31.115653Z","deleted":false,"ap_id":"https://lemmy.world/comment/13191617","local":false,"path":"0.12460077.12463002.12464464","distinguished":false,"language_id":0},"creator":{"id":3492260,"name":"NateNate60","avatar":"https://lemmy.world/pictrs/image/9eb82cb1-85b4-426a-807e-85f0f17562fb.jpeg","banned":false,"published":"2023-10-19T02:18:57.847760Z","actor_id":"https://lemmy.world/u/NateNate60","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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","removed":false,"published":"2024-10-31T19:01:54.198846Z","deleted":false,"ap_id":"https://lemmy.world/comment/13193634","local":false,"path":"0.12460077.12463002.12466866","distinguished":false,"language_id":37},"creator":{"id":55857,"name":"ProfessorScience","banned":false,"published":"2023-06-12T02:36:51.195880Z","actor_id":"https://lemmy.world/u/ProfessorScience","local":false,"deleted":false,"bot_account":false,"instance_id":24},"post":{"id":14681285,"name":"Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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I'm sure it does something logical and easy to understand.","url":"https://lemmy.world/pictrs/image/1bcb365d-7f03-4efe-a6ff-ef1e60a13576.png","body":"`^.?$|^(..+?)\\1+$`\n\n::: spoiler \nMatches strings of any character repeated a non-prime number of times\n:::\n\nhttps://www.youtube.com/watch?v=5vbk0TwkokM","creator_id":3492260,"community_id":24,"removed":false,"locked":false,"published":"2024-10-31T02:43:51.764415Z","updated":"2024-10-31T02:44:21.427164Z","deleted":false,"nsfw":false,"thumbnail_url":"https://lemmy.ml/pictrs/image/ca6b5ba5-c867-4f6e-b0eb-4bd52cab2d9c.png","ap_id":"https://lemmy.world/post/21463665","local":false,"language_id":0,"featured_community":false,"featured_local":false},"community":{"id":24,"name":"programmerhumor","title":"Programmer Humor","description":"Post funny things about programming here! 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