Miscellaneous Query Predicate Operators

The following operators perform specialized functions in query predicates.

Name	Description
`$expr`	Allows use of expressions in query predicates.
`$jsonSchema`	Validates documents against the given JSON Schema.
`$mod`	Matches documents based on the result of a modulo operation on a field value.
`$regex`	Matches documents where values match a specified regular expression.
`$where`	Matches documents that satisfy a JavaScript expression.

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