php preg_replace function

[eluser]basty_dread[/eluser]
how about to exclude the h1-h9 tag i would like to put - (dash) on every spaces..

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);

print_r($save);