express-static.js

  function onlyStatic (middleware) {
    return function (req, res, next) {
      var match = /(\.css|\.eot|\.gif|\.html|\.js|\.png|\.svg|\.ttf|\.woff)($|\?.*$)/ig.exec(req.originalUrl);
      if (!match) return next();
      middleware(req, res, next);
    };
  }
  
  //usage
  this.use(onlyStatic(express.static(__dirname  + "/public")));