function isDataUri(uri) {
  //>>includeStart('debug', pragmas.debug);
  Check.typeOf.string("uri", uri);
  //>>includeEnd('debug');

  return dataUriRegex.test(uri);
}
Determines if the specified uri is a data uri.

@function isDataUri

@param {string} uri The uri to test.
@returns {boolean} true when the uri is a data uri; otherwise, false.

@private