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run code in 150+ php & hhvm versions
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<?php function get_domain($url) { if ( !preg_match("/^http/", $url) ) $url = 'http://' . $url; if ( $url[strlen($url)-1] != '/' ) $url .= '/'; $pieces = parse_url($url); $domain = isset($pieces['host']) ? $pieces['host'] : ''; if ( preg_match('\(?<domain>[a-z0-9][a-z0-9\-]{1,63}?[a-z\.]{2,6})$/i', $domain, $regs) ) { $res = preg_replace('/^www\./', '', $regs['domain'] ); return $res; } return false; } var_dump(get_domain('Wmcareers.net.com'));
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/6IPo9 on line 11 bool(false)
Output for 4.3.0 - 4.3.10, hhvm-3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/6IPo9 on line 11 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.