jquery sortable with regexp

I am try开发者_如何学JAVAing to figure out the right regexp to match on list item id's.

For example:

<ul id="MyList" class="connectedSortable">
    <li id="id=1-32">Item 1</li>
    <li id="id=2_23">Item 2</li>
    <li id="id=3">Item 3</li>
    <li id="id=4">Item 4</li>
    <li id="id=5">Item 5</li>
    <li id="id=6">Item 6</li>
</ul>

On the serialize method, I want it to pull everything after the equal sign (=). For example, for the first item I need the id to be 1-32, for the second I need it to be 2_23.

    $(function () {
        $("#MyList, #OtherList").sortable({
            connectWith: '.connectedSortable',
            update: function () {
                $("#MyListOrder").val($("#MyList").sortable('serialize', { regexp: '/(.+)[=](.+)/)' }));
            }
        }).disableSelection();
    });

I tried the above, but that didn't quite work. My regexp expression is wrong and I don't know what it should be. Ideas?

UDPATE: Instead of using the serialize method, I decided to use toArray. That way I get the whole ID and can rip out the part I don't want server side.

According to the specs, the option should be named "expression", and you don't need the /.../ in the string, unless you pass a regular expression. This works:

.sortable('serialize', { expression: '(.+)=(.+)' })

or:

.sortable('serialize', { expression: /(.+)=(.+)/ })

Working Example: http://jsbin.com/oqejo3/2