Rego Keyword Examples: contains - Opa

Rego's contains keyword is used to incrementally build multi-value rules in a policy. Often, tasks like validation are defined as a series of checks and these break down nicely into a series of contains rules that evaluate to a larger result. A contains rule typically takes the following form:

rego

my_rule contains value if {
    # logic to check if the value should be set

    # set the value
    # value := ...
}

However, there are some different ways to use contains in a policy which are covered in the examples below.

:::note If you're looking for the built-in function contains for substring checking, you can read about it in the built-ins section. :::

Examples