set case sensitive only a search field

cala

hello!

Is it possible to set only a search field (for example only one of the column filters ) as key sensitive?

I've tried:

$( "input#sotto_cod" ).on( 'keyup change', function () {
    var data_input=this.value;
    table.columns([5]).search( data_input,false,true,false ).draw();
});

as found in the search() page:

search( input [, regex[ , smart[ , caseInsen ]]] )

but it doesn't seem to work.

Maybe I can use a personalized filter function as in http://datatables.net/development/filtering , but how can I fire this filter only from that input box?

Thank you for the help!