I want to sort some child divs under a parent div. The child divs has alphanumeric id. For example: "1_tango" , "5_charlie", "unassigned".

For the above example, the sort result should be:

"unassigned" , "1_tango" , "5_charlie",

The code I am using from here:

var mylist = $(this.sub_group_drop_zone);
var listitems = mylist.children('div').get();
listitems.sort(function (a, b) {
    var compA = $(a).text().toUpperCase();
    var compB = $(b).text().toUpperCase();
    return (compA > compB) ? -1 : (compB > compA) ? 1 : 0;
   })
$(mylist).append(listitems);

However this results in :

"unassigned", "5_charlie", "1_tango", "3_Beta" ..

How can I fix that. Any idea would be appreciated.