cfn-guard 3.2.0

AWS CloudFormation Guard is an open-source general-purpose policy-as-code evaluation tool. It provides developers with a simple-to-use, yet powerful and expressive domain-specific language (DSL) to define policies and enables developers to validate JSON- or YAML- formatted structured data with those policies.
Documentation 
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let template = Resources.*[ Type == 'AWS::New::Service']

let type = Resources.newServer.Type

rule SOME_RULE when %type !empty {
    let lower = to_lower(%type)
    %lower == "aws::new::service"
    %lower == /aws::new::service/

    let upper = to_upper(%type)
    %upper == "AWS::NEW::SERVICE"
    %upper == /AWS::NEW::SERVICE/
}