JSFiddle - React, Tailwind, and code Playground

JavaScript

var mystring= 'Hello';

var regex = /^([0-9A-F]{2}[:-]){5}([0-9A-F]{2})$/;

alert(regex.test(mystring));

mystring = '3D:F2:C9:A6:B3:4F';

alert(regex.test(mystring));