<?php
$howmuch="17шт / 119ml / 255грн";
if (preg_match("/\d+\s*грн/ui", $howmuch, $results)) { echo $results[0];
}
PD9waHAKCiRob3dtdWNoPSIxN9GI0YIgLyAxMTltbCAvIDI1NdCz0YDQvSI7CmlmIChwcmVnX21hdGNoKCIvXGQrXHMq0LPRgNC9L3VpIiwgJGhvd211Y2gsICRyZXN1bHRzKSkgewoJZWNobyAkcmVzdWx0c1swXTsKfQ==