substructure search

My database is not a bingo supported database, so I want to use the substructureMatcher method that comes with indigo. Gives a substructure to compare to another, if it is a substructure. Returns true, otherwise, returns false. But I don't know how to use this method, can there be an example for me to refer to, thank you very much.

Start by locating the Indigo substructureMatcher entry point and reviewing how the method is exposed for use with a database. Add an example showing the requested substructure comparison and its boolean result, while clarifying the database-support context. Done when a newcomer can follow the example to use the method.

Written by the indexing model from the issue text.