Hello!I gave this problem a little break, but now I have a solution, that works for me.I don't know much about php, but I have found the right code to use.
$myextrafield_splitted = split("<a href", $myextrafield);
I added it in my item.php where I have put my customised extrafield.Now my searchable labels are a nice list.Maybe someone with poor php skills (like me) will find it helpfull :)