Complete Matching:Queries will only be matched against the exact content of the property. For example, if you have a managed ...

Complete Matching:Queries will only be matched against the exact content of the property. For example, if you have a managed property "ID" that contains the string "1-23-456#7", complete matching only returns results on the query ID:"1-23-456#7", and not on the queries ID:"1-23" or  ID:"1 23 456 7".