Nouveau post :

L'essentiel sur les expressions régulières en JavaScript

https://kalvn.net/blog/l-essentiel-sur-les-expressions-regulieres-en-javascript/

Just going through the logs of my own mail server (Thanks, @mwl !) to extend my #postfix #fail2ban #regexp to ban hosts with too many unsuccesful login attempts. Knowing the user name pattern (example.com only letters, others with at least one dot) I came up with

'warning: .*\[<HOST>\]: SASL LOGIN authentication failed: .*sasl_username=<F-USER>(?:[^.]*@(?!example\.com)|[^.]*\.[^.]*@(?:example\.com))</F-USER>'

This works great.

#TFW #regexp в 6 строчек, написанный #ChatGPT, парсит #Markdown более лучше ①, чем тысячи строк #Redcarpet ② под капотом у #GlitchSoc

Sometimes Copilot Chat is amazing: #regexp #regex #ai

Un outil de remplacement de texte qui semble avoir une ergonomie un peu plus confortable que sed https://github.com/c0stya/trre #commandline #regexp #opensource

The {rematch2} #RStats is a “small wrapper on regular expression matching functions regexpr and gregexpr to return the results in tidy data frames.” By @gaborcsardi . On CRAN.
https://github.com/r-lib/rematch2#readme
#RegExp #RegEx

New at PragProg

Staffan Nöteberg helps you really understand how the machinery works under the hood. Learn advanced tools like reluctant, lookbehind and nondeterministic finite automata to write efficient and elegant regexes with ease.

In this illustrated guide, you gain precisely that understanding., even with no prior knowledge of Regular Expressions.

http://pragprog.com/titles/d-snrem

@staffannoteberg

Need help with regular expressions in R? Check out the RegExplain RStudio add-in by @grrrck
https://www.garrickadenbuie.com/project/regexplain/

https://gugod.org/2024/11/regexp-digits/

如果你在用正規表示式的 \d 在驗證來自使用者的輸入的話，你得再想想。

Updated version of my ideas for improving the JavaScript RegExp API: https://gist.github.com/rauschma/8db338a96f9ead8df0714d233e81fed4

I see a lot of unnecessarily specific regexs (typically excessive captures & pointless `.*$`) being used. Logic says they'll be slower so I spent about 90 seconds testing an example on 3 in-browser JS benchmark apps.
Comparing:
`/^(Hello), this is a string (.*)$/` to
`/^Hello, this is a string /`
the latter is 1.5-5x faster on all 3 apps.
#RegEx #RegExp #RegularExpression

Une idée incroyable : au lieu d'interpréter le pattern d'une expression régulière à l'exécution, cette librairie crée une classe Java exécutant le pattern au moment du build. Ca optimise considérablement l'exécution du code, évidement. Par contre, je ne vois pas (encore) comment intégrer ça dans un projet "classique" : pas de plugin maven ou de configuration de compilateur. Il y a donc … https://github.com/hyperpape/needle #java #regexp #library #optimisation #compilation #opensource

Une belle histoire d'expression régulière sur un sujet en apparence simple, mais aux conséquences désastreuses pour les performances. Ce qui est drôle, c'est que la bonne solution, c'est peut-être bien de passer par un parser XML qui éliminera correctement les commentaires. https://regexide.com/ #javascript #regexp #performance #algorithme #design

Useful #beginner #VIM #substitution #regexp #pattern for today:

I needed to add markdown to plaintext reference pattern e.g. "(photo 1)" .
~~~
%s/(\(photo [0-9]*\))/\*\0\*/g
~~~

and for any pattern that matches "(word Nchar)" e.g.: (figure 3c)

:%s/(\(\a* [0-9]*\a\))/\*\0\*/g

Also, I kept failing, because \a[0-9]* instead of [0-9]*\a . Which wasn't even intended, just a typo. (Pun not intended neither) :D

To my fellow #ActuallyAutistics who are also into programming. Can you handle #RegEx / #RegExp?

Up to how much complexity?

When I was younger, it was easy. Today, I have to use a test tool! ^_^;;

#Autistics #Autism #ActuallyAutistic #Autistic #AutismSpectrum #AskingAutistics

@autistics @actuallyautistic