Whats wrong witch my pattern on this function [duplicate]

error – Uncaught SyntaxError: Invalid regular expression: /^[0-9]{2}+-[0-9]{3}/: Nothing to repeat

function code :

kod.onblur = function(){
var regex = /^[0-9]{2}+-[0-9]{3}/i;
if(kod.value.match(regex)){
    span[3].innerHTML = "Poprawny kod";
    span[3].style.color = 'lime';
}else{
    span[3].innerHTML = "podaj Poprawny kod";
    span[3].style.color = 'lime';
}

i need to match somethink like that 19-200 or 10-621