code: function (content) {
      // Test against regex list
      var interpolateTest = _.templateSettings.interpolate.test(content);
      
      if (interpolateTest) {
          _.templateSettings.interpolate.lastIndex = 0;
          return true;
      }
      
      var evaluateTest = _.templateSettings.evaluate.test(content);
      
      if (evaluateTest) {
          _.templateSettings.evaluate.lastIndex = 0;
          return true;
      }
      
      var escapeTest = _.templateSettings.escape.test(content);
      _.templateSettings.escape.lastIndex = 0;
      return escapeTest;
  }
docs: Checks whether a string contains a template expression