<?
$text ="
Um script:
<?
echo 'Romano';
?>
Outro script:
<?
phpinfo();
?>
Que tal outro :
<html>
<?
session_start();
\$_SESSION['cont']++;
echo \$_SESSION['cont'];
?>
asddasdasd:
<?
echo '$teste';
?>
</html>
";
$text = preg_replace("/(.?)(<html>.?<\?.*?\?>.?<\/html>|<\?.*?\?>)(.?)/imse","'\\1<br/>'.highlight_string('\\2', TRUE).'<br/>\\3'",$text);
echo $text;
?>