JSFiddle - React, Tailwind, and code Playground

by nobuts

HTML

<p class="phone">2124771000</p>

JavaScript

$(".phone").text(function(i, text) {
      text = text.replace(/(\d\d\d)(\d\d\d)(\d\d\d\d)/, "+66 $1-$2-$3");
      return text;
    });