NestedSortable issue.

Hello all,
I am using NestedSortable plugin of jquery.
I want to use my own serializeRegExp in it, but I am failing to do it.
So please I want help for it about the syntax and how to use serializeRegExp
parameter in NestedSortable.
I am trying as following, but unfortunately, it is not working for me.
jQuery(function($) {
$('#LISTID').NestedSortable(
    {
     accept: 'page-item1',
     noNestingClass: "no-nesting",
     opacity: 0.8,
     helperclass: 'helper',
     onChange: function(serialized) {
     NodeChanged(serialized[0].hash)
     },
     serializeRegExp: ^[a-zA-Z0-9]+$,
     autoScroll: true,
     handle: '.sort-handle'
    }
);
});
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