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 hostname(url) {
    var match = url.match(/:\/\/(www[0-9]?\.)?(.[^/:]+)/i);
    if ( match != null && match.length > 2 && typeof match[2] === 'string' && match[2].length > 0 ) return match[2];
}

The above code will successfully parse the hostnames for the following example urls:

http://WWW.first.com/folder/page.html first.com

http://mail.google.com/folder/page.html mail.google.com

https://mail.google.com/folder/page.html mail.google.com

http://www2.somewhere.com/folder/page.html?q=1 somewhere.com

https://www.another.eu/folder/page.html?q=1 another.eu

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