language.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "The BCP-47 language tag. Composed of:<ul><li>The ISO-639 alpha-2 language code</li><li>(Optional) The ISO-15924 script tag</li><li>The ISO-3166 alpha-2 country code</li></ul>",
    "type": "string",
    "format": "paypal_common_language_v1",
    "maxLength": 10,
    "minLength": 2,
    "pattern": "^[a-z]{2}(?:-[A-Z][a-z]{3})?(?:-(?:[A-Z]{2}))?$"
}