$re = '/^(?:http|ftp)s?:\/\/([\w][^\/=\s]+)\/?|(^w{3}[\.\w][^\/\=\s]{2,})\/?/m';
$str = 'www.google.com.edu-hjj+oio?/kjhkh.txt hjjh
https://calendar.google.com/calendar/render?tab=ic&pli=1#main_7
http://www.yahoo.comhttp://www.yahoo.co
www.foo.com.ui/=hjg.hhj
ggfhgfhfhf.uui
https://regex101.com/
';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php