A DEVELOPER PROVED THE REGEX YOU'VE WRITTEN A THOUSAND TIMES IS SECRETLY A COMPILER AND THAT ALMOST NO ONE WHO USES THEM HAS ANY IDEA WHAT ACTUALLY RUNS36 minutes from Paul Wankadia, the engineer behind a regex engine that compiles your pattern straight down to raw machine code… https://t.co/XgyFxNmImW pic.twitter.com/pMhg9AxYbJ— slash1s (@slash1sol) June 5, 2026
regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
le0pard/re2js
RE2JS is the JavaScript port of RE2, a regular expression engine that provides linear time matching
Fast regex search: indexing text for agent tools · Cursor
How we're building indexes for regular expression search so agents can find text in large monorepos without the 15-second ripgrep waits.
brevity1swos/rgx
regex101 for the terminal — real-time matching, 3 engines, capture groups, replace mode, syntax highlighting, plain-English explanations, undo/redo, mouse support. Written in Rust.
Warnings for pattern matching
We examine the ML pattern-matching anomalies of useless clauses and non-exhaustive matches. We state the definition of these anomalies, building upon pattern matching semantics, and propose a simple algorithm to detect them. We have integrated the algorithm in the Objective Caml compiler, but we show that the same algorithm is also usable in a non-strict language such as Haskell. Or-patterns are considered for both strict and non-strict languages.
Regex Crossword
A crossword puzzle game using regular expressions. Earn achievements completing puzzle challenges. Easy tutorials for people new to regular expressions.
RFC: Decentralized Plugin Registry by ascorbic · Pull Request #694 · emdash-cms/emdash
Draft RFC for decentralised plugin registry. Rendered markdown: https://github.com/emdash-cms/emdash/blob/wip/plugin-rfc/rfcs/0001-plugin-registry.md
👋 Jan on Twitter / X
Introducing Jan-v1: 4B model for web search, an open-source alternative to Perplexity Pro.In our evals, Jan v1 delivers 91% SimpleQA accuracy, slightly outperforming Perplexity Pro while running fully locally.Use cases:- Web search- Deep ResearchBuilt on the new version… pic.twitter.com/YApIShOAHI— 👋 Jan (@jandotai) August 12, 2025
Rusty thoughts on "Parse, don't validate" - Eli Bendersky's website
Like many programmers, I find Alexis King's Parse, don't validate article fascinating, because it gives a name to an idiom that seems familiar and important - one I've observed and used in the past without naming it explicitly. This post is a review of the "Parse, don't validate" pattern applied to the Rust programming language (the original post uses Haskell). I was particularly interested in finding educational examples of this pattern in the Rust standard library and other well-known projects.
Roc on Twitter / X
New syntax, new compiler, new Roc ✨Watch the full talk on where the language is today and where we’re going:https://t.co/FltMYr1YiR— Roc (@roc_lang) November 25, 2025
Compiling Match Statements to Bytecode
Full pipeline deep dive for purple garden: AST, BB SSA IR, Bytecode, Optimisations