function extractDomain(url, y) {
  var domain;

  //remove protocol
  if (url.indexOf("://") > -1) {
    domain = url.split('/')[2];
  }
  else {
    domain = url.split('/')[0];
  }

  //remove port number
  domain = domain.split(':')[0];

  if (y == 1) {

    d = splitHostname(domain);

    if (d.subdomain != "www" && d.subdomain != "") {
      return d.subdomain;
    }
    else {
      return d.domain;
    }

  } else {
    return domain;
  }
}

function addhttp(url) {
  if (!/^(f|ht)tps?:\/\//i.test(url)) {
    url = "http://" + url;
  }
  return url;
}

function splitHostname(h) {
  var result = {};
  var urlParts = new RegExp('([a-z\-0-9]{2,63})\.([a-z\.]{2,5})$').exec(h);
  if (urlParts == null) {
    console.log("Error formatting link " + h);
    return "";
  }
  result.domain = urlParts[1];
  result.type = urlParts[2];
  result.subdomain = h.replace(result.domain + '.' + result.type, '').slice(0, -1);;
  return result;
}