How to get the domain name without www, subdomain, and com/net/org/etc [duplicate]

Answer 1

Building off of Shyam's answer and employing the concept suggested by Mark Baker to get the penultimate element of the namespace, I might suggest using a simpler regular expression that utilizes an anchored lookahead like the following:

function get_domain($url) {
    $matches = [];
    preg_match('/[\w-]+(?=(?:\.\w{2,6}){1,2}(?:\/|$))/', $url, $matches);
    return $matches[0];
}

Matches

• names in https://www.names.co.uk/
• domain1 in http://www.subdomain.domain1.com/
• domain2 in www.subdomain.domain2.net
• domain3 in subdomain.subdomain2.domain3.org/
• domain4 in http://domain4.com
• seventymm in http://www.seventymm.co.in/browse/buy-home-furnishing-bed-sheets-pack-of-3/2456/1/v2034/0/0/1/2/1/0/go