https://leetcode.com/problems/valid-palindrome/

valid_palindrome.py

import re
class Solution(object):
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        t = ''
        s = s.lower()
        for c in s:
            if re.match(r'[a-zA-Z0-9]', c):
                t = t + c
        print(t)
        return t == t[::-1]