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

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

Solved #bug today in #matomo import script.
Took me two weeks to find what went wrong.
Turns out if the host variable in the import script has no "http" in it, host is not recorded in database.
You gotta love #regexps

@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

Spent half a day polishing complex #regexps in #vim . And they work too, but perl has a little different standard, so I'm basically stuck in grep -p punching a file until it works. As they say in #taoup , sometimes you just have to brute force prototype. #unix #bashcore #hobbylinguist #hobbytranslator

@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

In the absence of #Mastodon #filter #regexps, my anti-twitter-RTs filter is now

twitter.com/

The trailing backslash catches links to tweets (twitter.com/screenname/12345 etc) but allows other mentions of twitter.com, e.g., a username.

@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

@randomatic @ChristosArgyrop@mstdn.science @HaplogroupNews @ChristosArgyrop@mastodon.social A previous employer of mine used re::engine::RE2 for many things, because a) you can cap the memory usage to avoid #DoS attacks, and b) the lead developer was all about premature optimization. https://metacpan.org/pod/re::engine::RE2

But you can’t use the /x flag for better readability, and we ran into some nasty #Unicode bugs and had to fall back to regular Perl #RegExps in those cases.

@Xiy
I was unclear; I use either ! or § for #regexps (%r, %R) but [...] for others of these... whatever you call them, because they define arrays.

@Xiy
I use this a lot for #Ruby #regular expressions; I typically use %𝚛!...!. Also, for arrays of symbols; less commonly for arrays of strings. Oddly enough, I'll use paired delimiters (such as brackets, braces, or parentheses) for any 𝘰𝘵𝘩𝘦𝘳 list of this sort, just not #regexps. Mostly brackets, since its an array.

I found locating an authoritative list of these, by implementing Ruby version, much more of a chore than I expected.

I'm trying some #filters for hiding posts by default:

SportsBall
Exagerration
Politics
RightWing
Tragedy
BuzzwordTrash (e.g. Kardashian or NFT)

The filters can do quite a bit without #regexps.