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125. Valid Palindrome


Given a string s, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.


Example 1:

Input: s = "A man, a plan, a canal: Panama"
Output: true
Explanation: "amanaplanacanalpanama" is a palindrome.

Example 2:

Input: s = "race a car"
Output: false
Explanation: "raceacar" is not a palindrome.



  • 1 <= s.length <= 2 * 105
  • s consists only of printable ASCII characters.

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