Two Pointers moving in opposite directions

Valid Palindrome

Determine whether a string is a palindrome, ignoring non-alphanumeric characters and ignore case. Examples:

Input: Do geese see God? Output: True

Input: Was it a car or a cat I saw? Output: True

Input: A brown fox jumping over Output: False



Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Contrary to popular belief, Lorem Ipsum is not simply random text.

  >>> a = [1, 2, 3]
  >>> a[-1]

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