Visualising regex / Regular Expressions Using a Syntax / Railroad Diagram

Ish via Simon Willison, in a blog post describing some recent updates to sqlite-utils that brings sqlite-utils/datasette a step close to doing what OpenRefine does (Apply conversion functions to data in SQLite columns with the sqlite-utils CLI tool), I note debuggex.com, a tool for visualising regular expressions as syntax diagrams (albeit, not open source, so no local running…).