code: function convertDefinedFormat (data) {
    if (!(data.type === 'string' && data.format)) {
      return data
    }
    const format = data.format
    delete data.format
    switch (format) {
      case 'date-time':
        data['pattern'] = constants.FORMAT_REGEXPS['date-time']
        break
      case 'email':
        data['pattern'] = constants.FORMAT_REGEXPS['email']
        break
      case 'hostname':
        data['pattern'] = constants.FORMAT_REGEXPS['hostname']
        break
      case 'ipv4':
        data['pattern'] = constants.FORMAT_REGEXPS['ipv4']
        break
      case 'ipv6':
        data['pattern'] = constants.FORMAT_REGEXPS['ipv6']
        break
      case 'uri':
        data['pattern'] = constants.FORMAT_REGEXPS['uri']
        break
      case 'uri-reference':
        data['pattern'] = constants.FORMAT_REGEXPS['uri-reference']
        break
      case 'json-pointer':
        data['pattern'] = constants.FORMAT_REGEXPS['json-pointer']
        break
      case 'uri-template':
        data['pattern'] = constants.FORMAT_REGEXPS['uri-template']
        break
      default:
        data['pattern'] = format
    }
    return data
  }
docs: Change JSON defined formats to RAML regex.
  
  @param  {Object} data
  @returns  {Object}