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MongoDB $regex operator i or I for case insensitive search
For this, you need to use case insensitive (i). Let us create a collection with documents −
> db.demo759.insertOne({SubjectName:"MySQL"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5eb02ba95637cd592b2a4ae7")
}
> db.demo759.insertOne({SubjectName:"MongoDB"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5eb02baa5637cd592b2a4ae8")
}
> db.demo759.insertOne({SubjectName:"mongodb"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5eb02baf5637cd592b2a4ae9")
}
> db.demo759.insertOne({SubjectName:"MONGODB"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5eb02bb85637cd592b2a4aea")
}Display all documents from a collection with the help of find() method −
> db.demo759.find();
This will produce the following output −
{ "_id" : ObjectId("5eb02ba95637cd592b2a4ae7"), "SubjectName" : "MySQL" }
{ "_id" : ObjectId("5eb02baa5637cd592b2a4ae8"), "SubjectName" : "MongoDB" }
{ "_id" : ObjectId("5eb02baf5637cd592b2a4ae9"), "SubjectName" : "mongodb" }
{ "_id" : ObjectId("5eb02bb85637cd592b2a4aea"), "SubjectName" : "MONGODB" }Following is the query implementing MongoDB regex operator −
> db.demo759.find({"SubjectName":{$regex:/mongodb/i}});This will produce the following output −
{ "_id" : ObjectId("5eb02baa5637cd592b2a4ae8"), "SubjectName" : "MongoDB" }
{ "_id" : ObjectId("5eb02baf5637cd592b2a4ae9"), "SubjectName" : "mongodb" }
{ "_id" : ObjectId("5eb02bb85637cd592b2a4aea"), "SubjectName" : "MONGODB" }
Updated on: 01-Jul-2020
448 Views
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