PHP קוד:
<?php
$str = '<input type="hidden" name="session1" value="8e987cf1b2f1f6ffa6a43066798b4b7f">';
preg_match_all("~<input(?:.+)type=[\'\"]hidden[\'\"](?:.+)name=[\'\"]([^\'\"]+)[\'\"](?:.+)value=[\'\"]([^\'\"]+)[\'\"]~Uis", $str, $matches);
var_dump($matches);