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Find documents which contain a particular value in MongoDB using Regular Expressions?
To find documents containing a particular value with Regular Expressions, use MongoDB $regex. Let us create a collection with documents −
> db.demo469.insertOne({"StudentName":"John Doe"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80532fb0f3fa88e227906b")
}
> db.demo469.insertOne({"StudentName":"Chris Brown"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80533ab0f3fa88e227906c")
}
> db.demo469.insertOne({"StudentName":"John Smith"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805341b0f3fa88e227906d")
}
> db.demo469.insertOne({"StudentName":"Jace Doe"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805347b0f3fa88e227906e")
}
> db.demo469.insertOne({"StudentName":"David Miller"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80534eb0f3fa88e227906f")
}Display all documents from a collection with the help of find() method −
> db.demo469.find();
This will produce the following output −
{ "_id" : ObjectId("5e80532fb0f3fa88e227906b"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5e80533ab0f3fa88e227906c"), "StudentName" : "Chris Brown" }
{ "_id" : ObjectId("5e805341b0f3fa88e227906d"), "StudentName" : "John Smith" }
{ "_id" : ObjectId("5e805347b0f3fa88e227906e"), "StudentName" : "Jace Doe" }
{ "_id" : ObjectId("5e80534eb0f3fa88e227906f"), "StudentName" : "David Miller" }Following is the query to find documents which contain a particular value in MongoDB −
> db.demo469.find({'StudentName': {'$regex':'john', '$options':'i'}});This will produce the following output −
{ "_id" : ObjectId("5e80532fb0f3fa88e227906b"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5e805341b0f3fa88e227906d"), "StudentName" : "John Smith" }
Updated on: 11-May-2020
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