php preg_replace function

[eluser]basty_dread[/eluser]
and also to turn it back to the original when the replacement is done?

if you could notice its already replaced and it put - on each spaces..
how could i remove that ?

Code:

$string = "the quick brown brown fox jumps over the lazy dog, Brown Fox. <h2>The-Brown-Fox</h2>";
$save = preg_replace('/<h.*>.*<\/h.*>/ie'," <what shouldi put here?&gt;" , $string);

Thanks..