To perform Regex search on integer value, you need to use $where operator. The syntax is as follows:
db.yourCollectionName.find({ $where: "/^yourIntegerPatternValue.*/.test(this.yourFieldName)" });
To understand the above concept, let us create a collection with document. The query to create a collection with document is as follows:
> db.regExpOnIntegerDemo.insertOne({"StudentId":2341234}); { "acknowledged" : true, "insertedId" : ObjectId("5c70370c75eb1743ddddce21") } > db.regExpOnIntegerDemo.insertOne({"StudentId":123234}); { "acknowledged" : true, "insertedId" : ObjectId("5c70371175eb1743ddddce22") } > db.regExpOnIntegerDemo.insertOne({"StudentId":9871234}); { "acknowledged" : true, "insertedId" : ObjectId("5c70371875eb1743ddddce23") } > db.regExpOnIntegerDemo.insertOne({"StudentId":2345612}); { "acknowledged" : true, "insertedId" : ObjectId("5c70372275eb1743ddddce24") } > db.regExpOnIntegerDemo.insertOne({"StudentId":1239812345}); { "acknowledged" : true, "insertedId" : ObjectId("5c70372975eb1743ddddce25") }
Display all documents from a collection with the help of find() method. The query is as follows:
> db.regExpOnIntegerDemo.find().pretty();
The following is the output:
{ "_id" : ObjectId("5c70370c75eb1743ddddce21"), "StudentId" : 2341234 } { "_id" : ObjectId("5c70371175eb1743ddddce22"), "StudentId" : 123234 } { "_id" : ObjectId("5c70371875eb1743ddddce23"), "StudentId" : 9871234 } { "_id" : ObjectId("5c70372275eb1743ddddce24"), "StudentId" : 2345612 } { "_id" : ObjectId("5c70372975eb1743ddddce25"), "StudentId" : 1239812345 }
Here is the query to do Regex search on integer value:
> db.regExpOnIntegerDemo.find({ $where: "/^123.*/.test(this.StudentId)" });
The following is the output:
{ "_id" : ObjectId("5c70371175eb1743ddddce22"), "StudentId" : 123234 } { "_id" : ObjectId("5c70372975eb1743ddddce25"), "StudentId" : 1239812345 }