Extract hostname name from string

Question

I would like to match just the root of a URL and not the whole URL from a text string. Given:

http://www.youtube.co         


        

Answer 1

function getHostName(url) {
  const urlStart: string = url.includes('//www.') ? '//www.' : '//';
  
  return url.substring(url.indexOf(urlStart) + urlStart.length).split('/')[0];
};

console.log(getHostName('https://stackoverflow.com/questions')) // stackoverflow.com

console.log(getHostName('stackoverflow.com/questions')) // stackoverflow.com