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Evaluation Query Operators

Evaluation operators return data based on evaluations of either individual fields or the entire collection's documents.


For details on a specific operator, including syntax and examples, click on the link to the operator's reference page.

Allows use of aggregation expressions within the query language.
Validate documents against the given JSON Schema.
Performs a modulo operation on the value of a field and selects documents with a specified result.
Selects documents where values match a specified regular expression.
Performs text search.
Matches documents that satisfy a JavaScript expression.
← $type
$expr →