The default behavior is to match any part of the word, which is useful in some cases, but more often than not I get too many results for some key words that match random unrelated works. Example ai will match to a large fraction of my notes, while as a word I will find only relevant documents. I can use a regular expression like /\Wai\W/ and it does what I need, but it’s a bit inconvenient to do it each time when I search for a specific term. Most search engines perform word matching and I sort of expect it by default.
Opinions and suggestions are welcome!