Overview

Fuse.js is a search engine written in JavaScript.

Fuse.js — Lightweight Fuzzy-Search Library

Powerful, lightweight fuzzy-search library for JavaScript with zero dependencies.

Fuse.js

It is very useful as a search engine when building frontend-only applications.

This time, when implementing exact non-match search using Fuse.js, I needed to craft the query carefully, so here are my notes.

Advanced Search

Fuse.js supports various types of searches, including exact/partial match and partial non-match. These are described on the following page.

fusejs.io

fusejs.io

A Japanese translation is also available in the following article:

https://qiita.com/Sashimimochi/items/4972b3dc333c6e5fb866#Extended Search

However, for exact non-match search, the query needed some special handling.

Exact Non-Match Search

For example, to search for items where the label field does not contain the exact string "悪党" (villain), I was able to partially achieve this with the following query. It searches for items that "do not start with 悪党" OR "do not end with 悪党."

{
	"$or": [
		{
			"label": "!^悪党" # "does not start with 悪党"
		},
		{
			"label": "!悪党$" # "does not end with 悪党"
		}
	]
}

However, note that this query is not perfect -- it will also exclude items with values like "悪党と悪党" (villain and villain).

Summary

There may be some misunderstandings in my explanation, but I hope this serves as a useful reference.