---
name: "mongoc_matcher"
section: "3"
platform: "linux"
package: "libmongoc-doc"
version: "1.23.1-1+deb12u3"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/mongoc_matcher"
---

# mongoc\_matcher(3)

Client Side Document Matching

## NAME

mongoc\_matcher - Client Side Document Matching

## BASIC DOCUMENT MATCHING (DEPRECATED)

**WARNING:**

This feature will be removed in version 2.0.

The MongoDB C driver supports matching a subset of the MongoDB query specification on the client.

Currently, basic numeric, string, subdocument, and array equality, **$gt**, **$gte**, **$lt**, **$lte**, **$in**, **$nin**, **$ne**, **$exists**, **$type**, **$and**, and **$or** are supported. As this is not the same implementation as the MongoDB server, some inconsistencies may occur. Please file a bug if you find such a case.

To test this, perform a **mongodump** of a single collection and pipe it to the program.

```
$ echo "db.test.insert({hello:'world'})" | mongo
connecting to: test
WriteResult({ "nInserted" : 1 })
bye
$ mongodump -d test -c test -o - | filter-bsondump
{ "_id" : { "$oid" : "537afac9a70e5b4d556153bc" }, "hello" : "world" }
```

## AUTHOR

MongoDB, Inc

## COPYRIGHT

2017-present, MongoDB, Inc