The code that runs my weblog, https://simonwillison.net/

This blog includes a built-in search engine. Here's how it works:

1. The search functionality is implemented in the search function in blog/search.py.
2. It uses a combination of full-text search and tag-based filtering.
3. The search index is built and updated automatically when new content is added to the blog.
4. Users can search for content using keywords, which are matched against the full text of blog entries and blogmarks.
5. The search results are ranked based on relevance and can be further filtered by tags.
6. The search interface is integrated into the blog's user interface, allowing for a seamless user experience.

For more details on the implementation, refer to the search function in blog/search.py.