php preg_replace function

[eluser]basty_dread[/eluser]

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',"str_replace(' ','-','$1')" , $string);
print_r($save);

echo "<br>";
echo preg_replace('/(<h.*>(.*)<\/h.*>)/ie',"str_replace('-',' ','$1')",$save);

i just put this to turn it back to its original. works great.. thank you..
i will experiment more on this..