function palindrome(str) {
  let pat = new RegExp("[a-z0-9]");
  let newStr = str.toLowerCase().split("").filter(x => pat.test(x));
  let testStr = newStr.join('');
  let reverseStr = newStr.reverse().join('');
  console.log(testStr);
  console.log(reverseStr);
  if(testStr === reverseStr){
    return true;
  }
  // Good luck!
  return false;
}



palindrome("eye");