솜씨좋은장씨

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, we define empty string as valid palindrome. Example 1: Input: "A man, a plan, a canal: Panama" Output: true Example 2: Input: "race a car" Output: false Solution import re class Solution: def isPalindrome(self, s: str) -> bool: s = s.lower() text = ..