$str = "& &svnips   Â ∴ ≈ osidnviosd & sopinsdo";   
$regex = "/&[^\w;]/";
echo preg_replace($regex, "&", $str);

I'm trying to replace all un-encoded ampersands with encoded ones.
The problem is it's removing the space between & and sopinsdo.

Herhangi bir fikir neden?