How to get first 2 and last 2 characters in javascript

I tried this, how can I make it become 'A1****D4'

let name = "AlB2C3D4";
let s = name.replace(name.substring(2),"*");

We can try a regex replacement with the help of a callback function:

var name = "AlB2C3D4";
var output = name.replace(/^(..)(.*)(..)$/, (a, b, c, d) => b + c.replace(/./g, "*") + d);
console.log(output);

The regex logic here is as follows:

• ^ from the start of the input
• (..) match and capture the first 2 characters
• (.*) match and capture the middle portion, excluding
• (..) the last two characters (but also capture those)
• $ end of the string

Then, in the callback/lambda function, we build the output, but we run a replace operation on the middle portion of the input, replacing every character with * to mask it.