frontend-21-22-learn-programming-with-javascript/more-exercises/solution-exercise-5.js

function isPalindrome(input) {
  const regex = /[\W_]/g;
  input = input.toLowerCase().replace(regex, '');
  let len = input.length;
  for (let i = 0; i < len/2; i++) {
    if (input[i] !== input[len - 1 - i]) {
        return false;
    }
  }
  return true;
 }
 console.log(isPalindrome("A man, a plan, a canal. Panama"));