Author here, happy to answer questions!

Simon already gave a great intro to my SQLite extensions, and I just want to point folks to Anton Zhiyanov's sqlean project, for pure-C extensions: https://github.com/nalgeon/sqlean

Also, some of these extensions are also packaged as Datasette plugins, so you can also run `datasette install datasette-sqlite-regex` or `datasette install datasette-sqlite-ulid` to add these extension to your Datasette instances! https://docs.datasette.io/en/stable/plugins.html