Run results for: extract-root-domain

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36

Browser: Chrome 78

Operating system: Windows 7

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
parseUri	121554.5 Ops/sec
url_domain	133129.6 Ops/sec
simple_domain	1268636.0 Ops/sec
url_class_hostname	258829.3 Ops/sec
url_class_hostname2	361934.0 Ops/sec

Script Preparation code:

   
  var link = "http://stackoverflow.com/questions/8498592/extract-root-domain-name-from-string";
  var host;
  
  // parseUri 1.2.2
  // (c) Steven Levithan <stevenlevithan.com>
  // MIT License
  
  function parseUri (str) {
  	var	o   = parseUri.options,
  		m   = o.parser[o.strictMode ? "strict" : "loose"].exec(str),
  		uri = {},
  		i   = 14;
  
  	while (i--) uri[o.key[i]] = m[i] || "";
  
  	uri[o.q.name] = {};
  	uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
  		if ($1) uri[o.q.name][$1] = $2;
  	});
  
  	return uri;
  };
  
  parseUri.options = {
  	strictMode: false,
  	key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],
  	q:   {
  		name:   "queryKey",
  		parser: /(?:^|&)([^&=]*)=?([^&]*)/g
  	},
  	parser: {
  		strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
  		loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
  	}
  };
  
  function url_domain(data) {
    var    a      = document.createElement('a');
           a.href = data;
    return a.hostname;
  }
  
  function simple_domain(url)
  {
  var matches = url.match(/^https?\:\/\/([^\/?#]+)(?:[\/?#]|$)/i);
  return matches[1];
  }
  
  function url_class_hostname(url)
  {
  return new URL(url).hostname;
  }
var url2 = new URL("https://jsperf.com/");
  function url_class_hostname2(url)
  {url2.href = url;
  return url2.hostname;
  }

Tests:

parseUri
host = parseUri(link).host;
url_domain
host = url_domain(link);
simple_domain
host = simple_domain(link);
url_class_hostname
var host = url_class_hostname(link);
url_class_hostname2
var host = url_class_hostname2(link);