Programming Test

Here’s a Python function `is_palindrome(s)` that checks whether a given string `s` is a palindrome (reads the same forwards and backwards), ignoring case and non-alphanumeric characters: ```python import re def is_palindrome(s): # Remove all non-alphanumeric characters and convert to lowercase cleaned_s = re.sub(r'[^a-zA-Z0-9]', '', s).lower() return cleaned_s == cleaned_s[::-1] # Test case: test_string = "A man, a plan, a canal: Panama" print(is_palindrome(test_string)) # Output: True ``` ### Explanation: 1. **Cleaning the string**: - `re.sub(r'[^a-zA-Z0-9]', '', s)` removes all non-alphanumeric characters (like spaces, punctuation). - `.lower()` converts the string to lowercase for case-insensitive comparison. 2. **Palindrome check**: - `cleaned_s == cleaned_s[::-1]` compares the cleaned string with its re reverse (`[::-1]` reverses the string). ### Test Case: ```python print(is_palindrome("racecar")) # True (simple palindrome) print(is_palindrome("No lemon, no melon")) # True (ignores spaces/punctuation) print(is_palindrome("hello")) # False ``` Would you like any modifications or additional test cases?