[рони]

Alfer,

jQuery("#sorting-table tr:visible .indexColumn:not(:contains('"+ this + "'))").parent().hide();

заменить на

var el = jQuery("#sorting-table tr:visible .indexColumn"), reg = new RegExp(this, 'i');
  el.each(function(indx, element){
                if(!reg.test($(element).text())) {$(element).parent().hide()}
        });