input: Write a python function to extract unique words from a given text.
  assert get_unique_words("hello world! hello universe.") == {"hello", "world", "universe"}
  assert get_unique_words("This is a test. This test is only a test.") == {"This", "is", "a", "test", "only"}
  assert get_unique_words("Python is fun. Python is powerful.") == {"Python", "is", "fun", "powerful"}
output: def get_unique_words(text):
      import re
      words = re.findall(r'\b\w+\b', text)
      return set(words)