JSFiddle - React, Tailwind, and code Playground

JavaScript

function macAddressValidation(macAdd) 
 {
  var RegExPattern = /^[0-9a-fA-F:]+$/;

  if (!(macAdd.match(RegExPattern)) || macAdd.length != 17) 
  {
   return false;
  }
  else
  {
   return true;
  }
 }

alert(macAddressValidation("01:23:45:67:89:ab"));