anchor.diff:          error_message: 'This name cannot contain special characters.'
         - must_match_regex: '\A[^0-9]*\z'
           error_message: 'This name cannot contain digits.'
  +    - name: example_cron
  +      type: string
  +      configurable: true
  +      optional: true
  +      constraints:
  +        - must_be_cron_schedule: true
  +          error_message: 'This must be a valid cron schedule.'
       - name: example_migrated_integer
         type: integer
         configurable: true
  
positive.code:               secret: (( .web_server.generated_secret_to_migrate_to_credhub_<%= major_and_minor_version %>.value ))
            configured:
              string: (( .web_server.example_string.value ))
              integer: (( .web_server.example_migrated_integer.value ))
              boolean: (( .web_server.example_boolean.value ))
              dropdown: (( .web_server.example_dropdown.value ))
  
negative.code:       - reference: .web_server.example_string
          label: Example string
          description: 'Configure a property of type string'
        - reference: .web_server.example_cron
          label: Example cron schedule
          description: 'Configure a property of type string with the must_be_cron_schedule constraint'
        - reference: .web_server.example_string_with_placeholder
          label: Example string containing Placeholder text
          description: 'Optional field. Configuration not necessary'
  