125. Valid Palindrome

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

For example,
"A man, a plan, a canal: Panama" is a palindrome.
"race a car" is not a palindrome.

Note:
Have you consider that the string might be empty? This is a good question to ask during an interview.

For the purpose of this problem, we define empty string as valid palindrome.

My Solution:

import re
class Solution:
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        return ''.join(re.compile(r"[A-Za-z0-9]").findall(s)).lower() == ''.join(re.compile(r"[A-Za-z0-9]").findall(s)).lower()[::-1]

Reference:

import string

class Solution:
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        remove_punctuation = str.maketrans('', '', string.punctuation)
        clean_s = s.translate(remove_punctuation).lower().replace(' ', '')
        return clean_s[::-1] == clean_s