<?php
$html = '
<a href="./?pg=194">194</a><a href="./?pg=2" rel="next" class="next_page">2</a>
';
preg_match_all('/<a.*href="\.\/\?pg=(\d+)".*>(?:.*)<\/a>/', $html, $preg_matches); echo max($preg_matches[1]);
PD9waHAKJGh0bWwgPSAnCjxhIGhyZWY9Ii4vP3BnPTE5NCI+MTk0PC9hPjxhIGhyZWY9Ii4vP3BnPTIiIHJlbD0ibmV4dCIgY2xhc3M9Im5leHRfcGFnZSI+MjwvYT4KJzsKCnByZWdfbWF0Y2hfYWxsKCcvPGEuKmhyZWY9IlwuXC9cP3BnPShcZCspIi4qPig/Oi4qKTxcL2E+LycsICRodG1sLCAkcHJlZ19tYXRjaGVzKTsKZWNobyBtYXgoJHByZWdfbWF0Y2hlc1sxXSk7Cgo=