input: Write a function to check if a string contains 'a' followed by any number of 'b's using regex. 
  assert text_match("msb") == 'Not matched!'
  assert text_match("a0c") == 'Found a match!'
  assert text_match("abbc") == 'Found a match!'
output: def text_match(text):
      import re
      if re.search(r'a*b', text):
          return 'Found a match!'
      else:
          return 'Not matched!'