preg_match busqueda con comodin!

[repara2]

Código PHP:

$string[] = '<span class="UNO">';
$string[] = '<span class="2">';
$string[] = '<span class="tres">';
$string[] = '<span class="kk">';
 
echo "<pre>";
foreach($string as $str)
{
    $result = preg_match("/<span class=\"(\d.)\"/", $str, $matches);
    if($result)
    {
        echo htmlentities($str)." contiene:<br>";
        print_r($matches);
        echo "<br>";
    }
    else echo htmlentities($str)." no contiene números.<br>";
 
}
echo "</pre>";
 

Saludos!