input: Write a function to find specific literal strings within a larger string using regular expressions.
  assert check_strings('The quick brown fox jumps over the lazy dog.', ['fox']) == 'Matched!'
  assert check_strings('The quick brown fox jumps over the lazy dog.', ['horse']) == 'Not Matched!'
  assert check_strings('The quick brown fox jumps over the lazy dog.', ['lazy']) == 'Matched!'
output: def check_strings(sentence, words):
      import re
      for word in words:
          if re.search(r'\b{}\b'.format(re.escape(word)), sentence):
              return 'Matched!'
      return 'Not Matched!'