Simon Willison’s Weblog

5th December 2017 - Link Blog

A Regular Expression Matcher: Code by Rob Pike, Exegesis by Brian Kernighan (via) Delightfully clear and succinct 30-line C implementation of a regular expression matcher that supports $, ^, . and * operations.

Posted 5th December 2017 at 6:36 pm

Recent articles

Live blog: Code w/ Claude 2026 - 6th May 2026
Vibe coding and agentic engineering are getting closer than I'd like - 6th May 2026
LLM 0.32a0 is a major backwards-compatible refactor - 29th April 2026

This is a link post by Simon Willison, posted on 5th December 2017.

c 53 regular-expressions 37 rob-pike 3

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe