var result = {
	0: { children: [] }	
};

$('div[id^="region"]').each(function() {
  el = $(this);
  var id = el.attr('id').slice(6);
  result[id] = {
    title: el.children('label').html(),
    children: [],
    id: id
  };

  var parent = el.parent().closest('div[id^="region"]');
  if (parent.length) {
    var pid = parent.attr('id').slice(6);
  } else {
    pid = 0;
  }
    
  result[pid].children.push(+id);
  
});