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FEEL includes many built-in functions. These functions can be invoked in expressions and unary-tests.

contains("", ".com")
// invoke function with positional arguments

contains(string: "", match: ".de")
// invoke function with named arguments

Read more about functions here.

This section is split into functions based on their primary operational data type:

Additionally, there are conversion functions that allow you to construct new values of a data type (factory functions).