The string on which you wish to apply the find. Can be any valid expression that resolves to a string or a null. If input refers to a field that is missing, $replaceAll returns null.
The string to search for within the given input. Can be any valid expression that resolves to a string or a null. If find refers to a field that is missing, $replaceAll returns null.
The string to use to replace all matched instances of find in input. Can be any valid expression that resolves to a string or a null.
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Replaces all instances of a matched string in a given input.
4.4
https://docs.mongodb.com/manual/reference/operator/aggregation/replaceAll/#mongodb-expression-exp.-replaceAll