how can a filter expression to allow wild card (*) - Richfaces 4.0

I am using filter expression in a datatable. I do know there are inbuilt function provided which says fn:containsIgnoreCase and fn:startWith. But my user would like to add a wild card to select what they want to filter with. how can I do it?  The below code does not work 





<rich:column width="60px" sortBy="#{wo.displayWO.status}" sortOrder="#{sortingBean.sortOrders['displayWO.status']}"


public Filter<DisplayWO> getStatusFilter() {

  return new Filter<DisplayWO>() {


   public boolean accept(DisplayWO t) {

   switch (statusFilterNumber) {