Skip Navigation

InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)F

fubo

@ fubo @lemmy.world

Posts
7
Comments
291
Joined
3 yr. ago

No relation to the sports channel.

  • Designers cry quietly

    Jump

  • "What the user needed" / "What management demanded"

  • Evangelical leaders celebrate Trump’s victory as a prophecy fulfilled

    Jump

  • As a reminder, helping the Antichrist bring about the end times does not earn them a spot in heaven, but rather in the lake of fire that burns with sulfur.

  • Trump, Vance and Allies Hurl Insults at Women as Race Ends

    Jump

  • If only free & consensual sex counts, Donald Trump is a virgin.

  • Removed Locked

    ‘SNL’: Hillary Clinton’s Running Mate Tim Kaine Makes Cameo but No One Can Remember His Name

    Jump

  • "Tim Kaine in the membrane, Tim Kaine in the brain"?

  • Trump fumes over mic issues at Milwaukee rally: ‘Do you want to see me knock the hell out of people backstage?’

    Jump

  • Merely being in the same room as his stinky ass might very well suffice.

  • Why did Donald Trump simulate oral sex with his microphone at Milwaukee rally?

    Jump

  • Because he misses having threesomes with Jeffrey and Ivanka?

  • Scoop: What Trump is being told

    Jump

  • This just in: Yes-men say "yes"

  • Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.

    Jump

  • Good catch! Typo. Fixed.

  • Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.

    Jump

  • Regex is good for a few very specific things, and sysadmins used to use it for goddamn everything. 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.

    These 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.

    But 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.

    (This is the "totally serious software engineering advice" forum, right?)

  • TIL that recipes are not protected by copyright law in the USA (and likely Canada)

    Jump

  • Yep. This is why online recipe sites put a whole goddamn personal essay before the actual recipe: if someone scrapes the page and copies it, they'll scrape the (copyrightable) essay as well as the (non-copyrightable) recipe.

  • Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.

    Jump

  • Whatever you do, don't get in a time machine back to 1998 and become a Unix sysadmin.

    (Though we didn't have CL-PPCRE then. It's really the best thing that ever happened to regex.)

  • Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.

    Jump

  • The answer given in the spoiler tag is not quite correct!

    According to the spoiler, this shouldn't match "abab", but it does.

    This will match what the spoiler says: ^.?$|^((.)\2+?)\1+$

    Any Perl-compatible regex can be parsed into a syntax tree using the Common Lisp package CL-PPCRE. So if you already know Common Lisp, you don't need to learn regex syntax too!

    So 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.

     
        
> (cl-ppcre:parse-string "^.?$|^(..+?)\\1+$")
(:ALTERNATION
 (:SEQUENCE :START-ANCHOR (:GREEDY-REPETITION 0 1 :EVERYTHING) :END-ANCHOR)
 (:SEQUENCE :START-ANCHOR
  (:REGISTER
   (:SEQUENCE :EVERYTHING (:NON-GREEDY-REPETITION 1 NIL :EVERYTHING)))
  (:GREEDY-REPETITION 1 NIL (:BACK-REFERENCE 1)) :END-ANCHOR))

    At 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.)

    The 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.

    The 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".

    So strings that this matches will be of non-prime length: zero, one, or a multiple of two numbers 2 or greater.

    But 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".

    If 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:

    ^.?$|^((.)\2+?)\1+$.

    Specifically, this replaces (..+?) with ((.)\2+?). The \2 matches the character captured by (.), so the whole regex now needs to see the same character throughout.

  • Deleted

    Permanently Deleted

    Jump

  • Crime is up in Trump's immediate vicinity because he keeps committing crimes and surrounding himself with people who commit crimes on his behalf.

    But that's a sampling error. Most of the country is not as crime-ridden as wherever he goes.

  • ‘Did Your Guest Just Say I Should Be Killed On Live TV?!’ Mehdi Hasan Can’t Believe What CNN Panelist Just Said to Him

    Jump

  • The suggestion is "don't link to Nazi sites".

  • Why did Raspberry Pi make their own SSD?

    Jump

  • Try text.

  • Deleted

    Permanently Deleted

    Jump

  • Even in a home poker game, it is not possible for all the players to go home having made a profit, whereas that is very possible in the stock market due to growth, labor, and natural resources.

    (The coal miner who gets a wage and black lung is not a player in the stock market. Neither is the sun, which provides free energy to agribusiness.)

  • Deleted

    Permanently Deleted

    Jump

  • In gambling, the house always wins, by extracting value from the players. In stock trading, the players (capitalists) collectively always win, by extracting value from labor, technological growth, and natural resources. These are not the same picture.

    Sure, you can take on as much risk as you like using derivatives, and emulate a gambler using the stock market as a source of randomness (volatility). But that's not how most traders behave, and it's not how most traders' payoffs work.

  • Deleted

    Permanently Deleted

    Jump

  • As the article mentions, Red Hat is IBM.

  • Deleted

    Permanently Deleted

    Jump

  • For what it's worth, getting in the habit of making excuses for one's use is part of alcoholism.