String Manipulation & Common Algorithms🌱 Beginner

function isValidPalindrome(s) {
  let left = 0;
  let right = s.length - 1;
  const isAlphaNumeric = (c) => /[a-zA-Z0-9]/.test(c);

  while (left < right) {
    while (left < right && !isAlphaNumeric(s[left])) left++;
    while (left < right && !isAlphaNumeric(s[right])) right--;
    if (s[left].toLowerCase() !== s[right].toLowerCase()) {
      return false;
    }
    left++;
    right--;
  }
  return true;
}

console.log(isValidPalindrome("A man, a plan, a canal: Panama")); // true