Regex Derivatives (Brzozowski Derivatives)
A Python sketch of a regex engine in less than 150 lines of code
In plain words
Regex Derivatives is a minimal Python implementation of a regex engine built using Brzozowski derivatives, contained in fewer than 150 lines of code. It is designed for developers interested in understanding how regex engines work at a fundamental level or studying alternative parsing approaches. The project stands out for its extreme simplicity and brevity while still functioning as a working regex implementation.
written from the facts on this page · September 2026
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I'm a big fan of the BBC podcast In Our Time -- and (like most people) I've been playing with the OpenAI APIs. In Our Time has almost 1,000 episodes on everything from Cleopatra to the evolution of teeth to plasma physics, all still available, so it's my starting point to learn about most topics. But it's not well organised. So here are the episodes sorted by library code. It's fun to explore. Web scraping is usually pretty tedious, but I found that I could send the minimised HTML to GPT-3 and get (almost) perfect JSON back: the prompt includes the Typescript definition. At the same time I…
AI · 2023 · genmon.github.io