Replace Substring in MongoDB document

Today this article will learn to write a query to replace substring in MongoDB document with an example.

We will replace a string in the Mongo document with the input string using a simple and easy approach i.e using $replaceOne aggregation operator.

We will cover below aspects,

 

We will update the records using the Mongo shell query.

We already looked at a simple way of adding or updating a new field to the document in our previous MongoDB sample series.

Getting started

Here below is a sample schema or document we shall use,

Replace Substring in MongoDB using replaceOne Aggregator

We are going to use a newly introduced aggregate operator to replace easily a string with matching criteria with part of the string.

Query Pattern Replace using $replaceOne

{ 
$replaceOne: { 
    input: <expression>, 
    find: <expression>, 
    replacement: <expression>}
}

In the above query,

input	Input string with search criteria.
find	Find the document with matching input string criteria.
replacement	The string to use to replace the first matched instance from input

You can replace the existing Mongo field using any other fields from the document using the above approach + using the approach discussed here.

Example using $replaceOne

In the below example, we will replace “total-order” with “order” in the mongo field.

Example

db.Orders.updateMany(
{ 
  Link: { 
    $regex: /total-order/ 
  } 
}, 
[{ 
  $set: { 
    Link: { 
      $replaceOne: { 
        input: "$Link", 
        find: "total-order", 
        replacement: "order" 
      } 
    } 
  } 
}])

Below is the schema post-update,

That’s all! Happy coding!

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