#regexes — Public Fediverse posts

#Development #Guides
Unicode character class escapes · “A hidden JavaScript superpower.” https://ilo.im/16e85n

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#Escapes #Unicodes #Emoji #RegExes #JavaScript #Browsers #WebDev #Frontend #Backend

Just for the record; I looked it up:

SNOBOL by Farber, Griswold and Polonsky was developed at Bell Labs (!), 1962–1967.
Its patterns are essentially as powerful as context-free grammars, but syntactically they are rather different from regexes.
Etc.

I didn't find out if there are any records of SNOBOL influencing Unix regex processing.
Obviously, that is likely, and it is also likely it has been written up.

#PatternMatching
#Regex
#Regexes
#Regexp
#Regexps
#SNOBOL

@dougmerritt @ed1conf

Raku: The match of a regex is automatically stored in $/, and this variable then also provides access to the text before ($/.prematch), to the text after ($/.postmatch), and to the match's position ($/.from and $/.to). Nice.

https://docs.raku.org/language/regexes#Literals_and_metacharacters

#raku #rakulang #regularexpressions #regex #regexes

Parser combinators in #Haskell are like the cool kids at school 🎓, effortlessly solving Advent of Code problems while #regexes are stuck in detention 🚫. Who knew regexes were still a thing in 2025? 😂 In Haskell, we leave those relics to flounder in the past while we flex our combinator muscles 💪.
https://entropicthoughts.com/parser-combinators-beat-regexes #ParserCombinators #AdventOfCode #FutureCoding #Flexibility #HackerNews #ngated

Parser Combinators Beat Regexes

https://entropicthoughts.com/parser-combinators-beat-regexes

#HackerNews #ParserCombinators #Regexes #CodingTechniques #FunctionalProgramming

#BadApple #demo in #vim only using search queries (6,500 #regexes)

https://eieio.games/blog/bad-apple-with-regex-in-vim/

#demoscene #regex #neovim

Never before had I considered the importance of "greedy" and "lazy" options for #regular expression matches. By default, regular expression engines try to match the maximum of a chain of characters, but for years I used #regexes not knowing the difference between "x?" and "+?". In one case the question mark says that "x" is optional, in the other, says that searching should stop as soon as a match was found. Clearly explained here and very important:

https://stackoverflow.com/questions/2301285/what-do-lazy-and-greedy-mean-in-the-context-of-regular-expressions

@neustradamus #PCRE continues to be a misnomer; it’s a modified subset of #Perl #RegularExpressions with dozens of differences: https://pcre.org/current/doc/html/pcre2compat.html

It's not "(C)ompatible." Accept no substitutes: https://perldoc.perl.org/perlre

#PCRE2 #PerlIncompatibleRegularExpressions #RegularExpression #RegExes #RegExps #regex #regexp

@sparkman Some people, when confronted with another person solving a problem with #RegularExpressions, think, “I know, I’ll quote @jwz.” Now they feel clever without having to contribute anything.

#RegExes #programming #coding #SoftwareDevelopment

@mort You can get pretty far with #Perl 5* #RegularExpressions. Here's @perlancar’s #CPAN module based on @randalschwartz’s minimal #JSON parser as a single #regex: https://metacpan.org/pod/JSON::Decode::Regexp

Full docs on conditional #regexes, including the special `(DEFINE)` form that merlyn used: https://perldoc.perl.org/perlre#condition-yes-pattern-no-pattern

* #RakuLang hasn't been called #Perl6 for four years now. You're deadnaming the language.

Looking at some #regexes for #email, ended up going through the "bang-path" rabbit hole (user1!serv1!serv2!moreservs!someserv!user2) and other ancient stuff, finally finding: http://www.textfiles.com/humor/COMPUTER/mr.prtocl

@profoundlynerdy I don’t know anything about #Rakudo’s internals, but Is there any conceivable way for a language-neutral subset of #RakuLang #regexes to be based on or share its code rather than reimplement them?

The subset might omit things like code interpolation. Or is it all-or-nothing?

It would be a nice teaser for the full power of Raku grammars, kind of like how #iTunes for Windows was #SteveJobs’ offer of “a glass of water to somebody in hell.” https://a.co/5J0CTSL

@profoundlynerdy I don’t think other languages *have* “ripped off” #RakuLang #regexes and grammars. The point of a notional “RCRE” library would be to enable that.

Any #RakuLang core hackers want to take up this challenge?

#RegularExpressions #RegExps #RegExes #RegEx https://ruby.social/@gd/110718818730295923

@malwareminigun @jernej__s #Perl has readability affordances for #regexes that nothing else can touch: https://perldoc.perl.org/perlre#%2Fx-and-%2Fxx

Congratulations @siegel and @bbedit for another great feature story on the #Mac #AppStore. "Where Respect Is Due," indeed!

https://apps.apple.com/us/story/id1435835881

Here are some earlier #BBEdit stories:

• Why it's the #TextEditor of choice for #coding, #writing, #DataScience, and more: https://apps.apple.com/us/story/id1433999132

• Tips for prose #writers: https://apps.apple.com/us/story/id1451975928

• Learn and experiment with #RegularExpressions for finding and modifying text in your actual work—safely! https://apps.apple.com/us/story/id1485320067
#RegEx #RegExes

@regehr @commodore @dev There is even a (low-severity, a/k/a “cruel”) #PerlCritic policy to discourage everything but $_, @_, $], and numbered #RegularExpression capture variables: https://metacpan.org/pod/Perl::Critic::Policy::Variables::ProhibitPunctuationVars

https://metacpan.org/pod/Perl::Critic::Policy::Variables::ProhibitMatchVars already protects you against the performance-sapping $`, $&, and $' match variables

And you can configure your own prohibited list with https://metacpan.org/pod/Perl::Critic::Policy::Variables::ProhibitEvilVariables

#Perl #RegEx #RegExp #RegExes #RegExps

@Codely @drupler It helps to build your complicated #RegularExpressions in pieces and store them in separate variables. You can then test them in isolation and not be confused when you concatenate them together for your actual matching.

Both #PHP and #JavaScript also support named capture groups if you’re doing replacements. They’re a lot more readable.

Also, PHP’s #PCRE-based engine has a PCRE_EXTENDED flag that lets you add whitespace, newlines, and comments.

#regexes #regexps

@Perl Are you working through the #OReilly #book ‘Learning #Perl’? Get extra practice with co-author brian d foy’s ‘Learning Perl Exercises’ #ebook: https://leanpub.com/learning_perl_exercises

Don’t have ‘Learning Perl’ yet? Buy it in paperback or ebook here: https://shop.aer.io/oreilly/p/learning-perl-8th/9781492094951-9149
Prefer #Amazon #Kindle? https://amzn.to/3QZj7t6 (affiliate link)

#books #bookstodon #coding #programming #SoftwareDevelopment #ProgrammingLanguages #Perl5 #RegularExpressions #regexes #regexps #Unicode #CPAN

@sjn @cb 99% of the “#Perl is line noise” complaints are because of unformatted #RegularExpressions. Every language worth anything eventually supports them, but only @Perl (and #awk, earlier) makes them first-class citizens. And with Perl you can format and comment them for readability: https://perldoc.perl.org/perlretut#Embedding-comments-and-modifiers-in-a-regular-expression

We format the rest of our code for humans. Why not #regexps?

#PerlCritic can warn against bad regexps: https://metacpan.org/search?size=200&q=module%3APerl%3A%3ACritic%3A%3APolicy%3A%3ARegularExpressions

#regex #regexes #programming #coding #SoftwareDevelopment

Oh yes! Just what I need before I deliver a training session on #regexes

#ACDC #PwrUp

One of my goto books for #regexes. This is the Nov '97 edition that I sought out after I read a review that said it was a good edition for #python too. Referring to it right now...

Remember when #programming #humor wasn’t all #memes about “durr #regexes hard,” “hurr can’t exit #vim,” and other admissions of stupidity?