Partially mask email address - javascript

Question

How can I partially hide email address like this in Javascript?

[email protected] => ex**pl**ai*@domain.com

I have modify the below code, but can get the result that I need, it's just return this result:

exam*******@domain.com

email.replace(/(.{4})(.*)(?=@)/, function (gp1, gp2, gp3) {
for (let i = 0; i < gp3.length; i++) {
  gp2 += "*";
}
return gp2;

});

Answer 1

You could seach for a group of four characters and replace a group of two until you found an @ sign-

const
    mask = string => string.replace(
        /(..)(.{1,2})(?=.*@)/g,
        (_, a, b) => a + '*'.repeat(b.length)
    );

console.log(mask('[email protected]'));