Write a program that checks whether a given string is a palindrome, ignoring punctuation, whitespace, and letter casing.
Example:
Input: "A man, a plan, a canal: Panama" Output: True
First, remove all punctuation and whitespace from the string and convert it to lower case. Then, compare the resulting string with its reverse to check if the input string is a palindrome.
import re
def is_palindrome(s):
s = re.sub(r'\W+', '', s).lower()
return s == s[::-1]
print(is_palindrome("A man, a plan, a canal: Panama")) # Outputs: True
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