$re = '/(?<_KEY_1>[\w\.]+):(?<_VAL_1>[\w\.]+)/m';
$str = ' <vuln:vulnerable-software-list>
<vuln:product>cpe:/o:novell:opensuse:13.1</vuln:product>
<vuln:product>cpe:/a:samba:rsync:3.1.1</vuln:product>
<vuln:product>cpe:/o:novell:opensuse:13.2</vuln:product>
</vuln:vulnerable-software-list>';
preg_match_all($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