code: def _exact_match(response, matches, insensitive, fuzzy):
      '''
      returns an exact match, if it exists, given parameters
      for the match
      '''
      for match in matches:
          if response == match:
              return match
          elif insensitive and response.lower() == match.lower():
              return match
          elif fuzzy and _exact_fuzzy_match(response, match, insensitive):
              return match
      else:
          return Nonf _exact_match(response, matches, insensitive, fuzzy):
      '''
      returns an exact match, if it exists, given parameters
      for the match
      '''
      for match in matches:
          if response == match:
              return match
          elif insensitive and response.lower() == match.lower():
              return match
          elif fuzzy and _exact_fuzzy_match(response, match, insensitive):
              return match
      else:
          return None
docs: returns an exact match, if it exists, given parameters
      for the match