正文
125. Valid Palindrome(判断忽略标点的字符串是否回文，加个正则，与上一题解法一样)
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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.
class Solution:
def isPalindrome(self, s):
"""
:type s: str
:rtype: bool
"""
if s=='':
return True
import re
x = re.sub('\W','',s).lower()
if x=='':
return True
if(len(x)%2!=0):#数
for i in range(int(len(x)/2)+1):
if(x[i]!=x[len(x)-i-1]):
return False
else:
for i in range(int(len(x)/2)+1):
if(x[i]!=x[len(x)-i-1]):
return False
return True
