https://jsfiddle.net/alirokni/5ucmwoft/16/#run

by alirokni November 21, 2018

HTML

<div id="k">test</div>
<div id="l">test</div>

JavaScript

var phone = '123231241604';
document.querySelector('#k').innerHTML = '(XXX) XXX-'+phone.match(/(\d{4})$/g);
var phone1 = '123231241604';
document.querySelector('#l').innerHTML = '(XXX) XXX-'+phone1.slice((phone1.length)-4)

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https://jsfiddle.net/alirokni/5ucmwoft/16/#run

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Join the 4+ million users, and keep the JSFiddle dream alive.

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