PHP regular expression to replace nested () with []

Question

I am trying to match a string, see example, such that a nested parantheses () is replaced by [] so to not break a parser somewhere else. In this case, I would like to replace t

Answer 1

$myStr = "Arman; Dario (10040 Druento (Turin), IT)";

$pattern = "/(.*\(.*)\(([^()]+)\)(.*)/";
if (preg_match_all($pattern,$myStr,$matches))
    {
        print( $matches[1] . '[' . $matches[2] . ']' . $matches[3] );
    }

You can run it through that until it doesn't match

while( preg_match_all($pattern,$myStr,$matches)) )
{
    $mystr = $matches[1] . '[' . $matches[2] . ']' . $matches[3];
}