input: Write a python function to check if a given text is a palindrome.
  assert is_palindrome("A man, a plan, a canal, Panama") == True
  assert is_palindrome("No lemon, no melon") == True
  assert is_palindrome("Hello, World!") == False
output: def is_palindrome(text):
      import re
      cleaned_text = re.sub(r'[^A-Za-z0-9]', '', text).lower()
      return cleaned_text == cleaned_text[::-1]