Regex per validare stringa input ........

[whisher]

function checkString($string)
{
    $check = false;
    if(!ereg("(^[a-zA-Z0-9]+([a-zA-Z\_0-9\,]{3,12}))$",$string))
    {
        $check = true;
        
    }
    $array = explode(",",$string);
    $count = count($array)-1;
    if(count($array)<2)
    {
        $check = true;
    }
    if(empty($array[$count]))
    {
        $check = true;
    }
    foreach($array as $row)
    {
        if((strlen($row)>3) || (strlen($row)<1))
        {
            $check = true;
            return $check;
        }
    }
    return $check;
}
var_dump(checkString("pi,oo,#p")); 

Se trovate qc o qc di meglio
postate postate postate ........