function removeStyle($string) {
	$except = array('font-weight', 'text-decoration', 'color'); // declare your exceptions 
	$allow = implode($except, '|'); 
	$regexp = '@([^;"]+)?(?<!'.$allow.'):(?!\/\/(.+?)\/)((.*?)[^;"]+)(;)?@is'; 
	$out = preg_replace($regexp, '', $string); 
	$out = preg_replace('@[a-z]*=""@is', '', $out); // remove any unwanted style attributes
	return $out;
}