Pattern

Validates that a string configuration field matches the given regular expression.

When a configuration is loaded, the field value is checked against regex. If it does not match, a validation error is raised. An optional description can be provided to give users a human-readable explanation of the expected format.

Usage:

data class NetworkConfig(
    @Pattern(
        regex = "^(?:[0-9]{1,3}\\.){3}[0-9]{1,3}$",
        description = "Must be a valid IPv4 address"
    )
    val bindAddress: String = "0.0.0.0",

    @Pattern(regex = "^[a-z][a-z0-9-]*$")
    val hostname: String = "app-server"
)

See also