Mongodb's strange fuzzy query Problem

Db. keke. insert ({name: hky}); db. keke. find () {_ id: ObjectId (50222ec24875597a6291d35c), name: hky} db. keke. find ({name: {$ regex: hk}); {_ id: ObjectId (50222ec24255597a6291d35c), name: hky} But db. keke. find ({name: h

Db. keke. insert ({name: "hky"}); db. keke. find () {"_ id": ObjectId ("50222ec24255597a6291d35c"), "name": "hky"} db. keke. find ({"name": {$ regex: 'hk '}); {"_ id": ObjectId ("50222ec24255597a6291d35c"), "name ": "hky"} But db. keke. find ({name:/h

Db. keke. insert ({name: "hky "});

Db. keke. find ()
{"_ Id": ObjectId ("50222ec24255597a6291d35c"), "name": "hky "}

Db. keke. find ({"name": {$ regex: 'hk '}});

{"_ Id": ObjectId ("50222ec24255597a6291d35c"), "name": "hky "}

However

Db. keke. find ({name:/hk /});

The returned result is null, the VM, and the US space. A lot of information says db can be used. keke. find ({name:/hk/}); fuzzy query. Why am I not doing this?