"Exploring Emacs rx Macro": symbolic/parser-like regular expressions
reddit / emacs

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gwern · 2022-03-28 01:20



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lebensterben · 2022-03-28 01:29

the rx syntax is very similar to parser combinator syntax

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gwern · 2022-03-28 02:11

Isn't it? There's a similar thing in [CL-
PPCRE](https://edicl.github.io/cl-ppcre/#create-scanner2) too, but
doesn't look like anyone has made the comparison there either.

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[deleted] · 2022-03-28 07:19

> (require 's)  ;; All we need is =s-matches-p=

In that case you don't need that library at all, as `string-match-p`
already exists.

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XCapitan_1 · 2022-03-28 07:44

rx is amazing. I'd use it in every programming language if I could

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phundrak · 2022-03-28 14:09

`s`, `f`, and `dash` are way too often used for stuff simple vanilla
Elisp already does anyways.

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[deleted] · 2022-03-28 16:16

Which is especially annoying if you want to quickly try out a package
or snippet but you don't have these leftpad-esque dependencies
installed.  I honestly regard these libraries as a kind of code-smell
(dash perhaps less than the others), that might correlate that the
developer took a *Rosetta stone*-approach of just translating whatever
logic they are familiar with from other languages, instead of engaging
with what constitutes an idiomatic style of Elisp.

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[deleted] · 2022-03-28 16:22

I sketched up a cheap [knockoff](https://wwwcip.cs.fau.de/%7E%6F%6A%31
%34%6F%7A%75%6E/src+etc/re.h) for C a while back.