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MongoDB regular expression to match a specific record?
Let us first create a collection with documents −
> dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "John" },"StudentAge":21 }); { "acknowledged" : true, "insertedId" : ObjectId("5cf227acb64a577be5a2bc07") } > dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "JOHN" },"StudentAge":19 }); { "acknowledged" : true, "insertedId" : ObjectId("5cf227b8b64a577be5a2bc08") } > dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "Carol" },"StudentAge":20 }); { "acknowledged" : true, "insertedId" : ObjectId("5cf227c2b64a577be5a2bc09") }
Following is the query to display all documents from a collection with the help of find() method −
> dbworkingOfRegularExpressionDemofind();
This will produce the following document −
{ "_id" : ObjectId("5cf227acb64a577be5a2bc07"), "StudentDetails" : { "StudentName" : "John" }, "StudentAge" : 21 } { "_id" : ObjectId("5cf227b8b64a577be5a2bc08"), "StudentDetails" : { "StudentName" : "JOHN" }, "StudentAge" : 19 } { "_id" : ObjectId("5cf227c2b64a577be5a2bc09"), "StudentDetails" : { "StudentName" : "Carol" }, "StudentAge" : 20 } Following is the regular expression to get the document with StudentName JOHN: > dbworkingOfRegularExpressionDemofind({'StudentDetailsStudentName': /JOHN/});
This will produce the following document −
{ "_id" : ObjectId("5cf227b8b64a577be5a2bc08"), "StudentDetails" : { "StudentName" : "JOHN" }, "StudentAge" : 19 }
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