Select div class name with jquery

Here a sample of what you need, to illustrate i made this when you click the div.

// The selector just get all class starting with mb
$('[class^="mb"]').on('click', function() {
   alert($(this).attr('class').split('-')[1]);
});

And here is the FIDDLE

If you have already selected the div you can iterate over its classes, and split each class on hyphen. Something like...

$.each($('div').attr('class').split(/s+/), function(idx, val) {
    var parts = val.split('-');
    var classBase = parts[0];
    var classModifier = parts.length > 1 ? parts[1] : null;

    if(classModifier !== null) alert("found class modifier" + classModifier);
});

If divs have more than one class, you can do this:

$('[class^="mb"]').on('click', function() {
     alert($(this).attr('class').split(' ')[0].split('-')[1]);
});

This will get first class of element first, second, split it with - and return the number.

Here is the updated Gonzalo Bahamondez's fiddle.