Question

How can I filter for all id’s that begin with “pre” or “radio”?

$.each($(':input[id^="pre"]',':input[id^="radio"]').serializeArray(), function() {                                                      

Answer 1

your selector was a bit off:

$('input[id^="pre"], input[id^="radio"]').each(function () {});

or if you want to serialize the set of returned objects:

$('input[id^="pre"], input[id^="radio"]').serializeArray();