How do I reset tokenization?

The database property search.index.wordbreak.characters controls tokenization for full-text search. If you want to reset tokenization, setting this value to an empty string does not reset it [1]. Instead, you can "reset" it by setting the tokenizing characters to a nonsense string like ",." (without quotes), like this:

Note you will need to offline the DB, save the properties, and online the DB again. This may take some time, as the text indices are being rebuilt.

[1] This behavior will be fixed in a future release of Stardog.