get numeric part of ID

Question

If I have the following element:

<div id="ITEM22"></div>

I can get the id like this:

$(this).attr('id');

But how can I get just the numeric part of this if, i.e. 22 ?

EDIT: ITEM is always a prefix.

Answer 1

var thenumber22 = $(this).attr('id').match(/(\d+)/)[1]