How to insert this JS validation for NRIC field

[mynotion]

I wanna put in this JS for validate correct Singapore NRIC field. How and where can I insert this code on Quform 1.8x?

https://gist.github.com/eddiemoore/7131781

//Based on http://www.samliew.com/icval/
function validateNRIC(str) {
if (str.length != 9)
return false;

str = str.toUpperCase();

var i,
icArray = [];
for(i = 0; i < 9; i++) {
icArray[i] = str.charAt(i);
}

icArray[1] = parseInt(icArray[1], 10) * 2;
icArray[2] = parseInt(icArray[2], 10) * 7;
icArray[3] = parseInt(icArray[3], 10) * 6;
icArray[4] = parseInt(icArray[4], 10) * 5;
icArray[5] = parseInt(icArray[5], 10) * 4;
icArray[6] = parseInt(icArray[6], 10) * 3;
icArray[7] = parseInt(icArray[7], 10) * 2;

var weight = 0;
for(i = 1; i < 8; i++) {
weight += icArray[i];
}

var offset = (icArray[0] == "T" || icArray[0] == "G") ? 4:0;
var temp = (offset + weight) % 11;

var st = ["J","Z","I","H","G","F","E","D","C","B","A"];
var fg = ["X","W","U","T","R","Q","P","N","M","L","K"];

var theAlpha;
if (icArray[0] == "S" || icArray[0] == "T") { theAlpha = st[temp]; }
else if (icArray[0] == "F" || icArray[0] == "G") { theAlpha = fg[temp]; }

return (icArray[8] === theAlpha);
}

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