问如何验证多行字符串是否为有效的YAML？

EN

node {
    def CUSTOM_YAML = '''\
        foo: "bar"
        baz:
        - "baz1"
        - "baz2"
    '''
     
    try {
        // Parse the YAML. Does basic syntax checking.
        def config = readYaml text: CUSTOM_YAML
     
        // Validate YAML data.
        assert config.foo == 'bar'     
        assert config.baz.size() >= 2
    }
    catch( Exception e ){
        // Handle syntax error        
    }
    catch( AssertionError e ){
        // Handle data validation error (assert's)        
    }
}