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function loopUntilMatch(value) {

    var rgxp =  new RegExp("([a-zA-Z0-9]{2}(?!-)(?=[a-zA-Z0-9]+))");

    if(!rgxp.test(value)) {

        return value;
    } else {

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        return loopUntilMatch(value);
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}

function kentekenHandler(element) {

    rep = element.value;

    rep = loopUntilMatch(rep);
    var newKtRgxp = new RegExp('^([a-zA-Z]{2}|[0-9]{2})-?([a-zA-Z]{2})-?([a-zA-Z]{1})([0-9]{1})$');

    if(newKtRgxp.test(rep)) {

        rep = rep.replace(newKtRgxp,"$1-$2$3-$4");
    }

    element.value = rep;
}