Valid Palindrome II with Alphanumeric and Case Ignore

meta Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome by deleting one character. Consider only alphanumeric characters and ignore cases. Example: Input: "abca" Output: True Explanation: You could delete the character 'c'. Input: "racecar" Output: True Input: "hello" Output: False Example Input abca