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Validate user input to start with 2 letters and follow with 4 numbers

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You can have a JS like the example below in the Footer


var inputfield= document.getElementsByName('InsertRecordFIELDNAME')[0];
inputfield.onchange= function (){
var str=inputfield.value; 
if(str.length > 0 && str.length <7) {
var res = str.substring(0, 2);
var res2 = str.substring(2, 6);
if (!/^[a-zA-Z]+$/.test(res)) alert('It should start with 2 letters'); 
if (isNaN(res2)) alert('It should end with 4 numbers'); 
} else {
alert('the length is exceeding');


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