Phone Number Sanitize and Print Friendly

phone.js

var phone = '2125551212';
// make 10 digit phone number pretty
phone = phone.replace(/[^\d]+/g, '')
     .replace(/(\d{3})(\d{3})(\d{4})/, '($1) $2-$3');

// (212) 555 - 1212
console.log(phone);

var inputPhone = "(212) 555 - 1212";
var cleanPhone = inputPhone.replace(/\D/g,''); 

// 2125551212
console.log(cleanPhone);


// functional approach

function formatPhoneNumber(phoneNumberString) {
  var cleaned = ('' + phoneNumberString).replace(/\D/g, '')
  var match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/)
  if (match) {
    return '(' + match[1] + ') ' + match[2] + '-' + match[3]
  }
  return null
}