old_contents: /*global define*/
  define([
          './defined'
      ], function(
          defined) {
      "use strict";
  
      var dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/;
  
      /**
       * DOC_TBA.
       *
       * @exports isArray
       *
       * @param {Object} value DOC_TBA.
       * @returns {Boolean} true DOC_TBA.
       *
       * @private
       */
      function isDataUri(uri) {
          if (defined(uri)) {
              var result = dataUriRegex.exec(uri);
              return (result !== null);
          }
  
          return false;
      }
  
      return isDataUri;
  });
new_contents: /*global define*/
  define([
          './defined'
      ], function(
          defined) {
      "use strict";
  
      var dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/;
  
      /**
       * Determines if the specified uri is a data uri.
       *
       * @exports isDataUri
       *
       * @param {String} uri The uri to test.
       * @returns {Boolean} true when the uri is a data uri; otherwise, false.
       *
       * @private
       */
      function isDataUri(uri) {
          if (defined(uri)) {
              var result = dataUriRegex.exec(uri);
              return (result !== null);
          }
  
          return false;
      }
  
      return isDataUri;
  });
subject: Improve isDataUri doc