$re = '/https?:\/\/s3\.eu-west-3\.amazonaws\.com\/[^>]+/m';
$str = 'https://s3.eu-west-3.amazonaws.com/sd56sqs/sd56sqs.html#qs=r-aghbhafcdbgkfgfaekhkggeakjefifcadkeheabababadgaffaceadhgadgheakcdggacb';
preg_match_all($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