Matching of a term in a query string to indexed terms, with explicit wildcard characters at the start and end of the query term. A match occurs when the characters in the query term (minus the wildcard characters) match the beginning, ending, or middle of an indexed term. For example, the query string *cat* will match cat, concatenate, tomcat, and cattle. Search Kit supports substring searching in inverted and inverted-vector indexes. See also search.