BSONObj query = BSON("name" << BSONRegex("joh?n", "i")); auto cursor = coll.find(query);
BSONObj query = BSON("name" << BSONRegex("joh?n", "i")); BSONObj update = BSON("$set" << BSON("status" << "active")); coll.update(query, update, false, true);In this example, the update() method is used to update all documents in a collection that have a field named "name" with a value that matches the regular expression "joh?n". The $set operator is used to set the value of the "status" field to "active". These examples use the C++ BSON library, which is part of the MongoDB C++ driver. The driver is available as a separate package that can be downloaded and installed from the official MongoDB website.