code: def ports_str_check_failed(port_str):
      
  
      pattern = r'[^TU:0-9, \-]'
      if (
          re.search(pattern, port_str)
          or port_str.count('T') > 1
          or port_str.count('U') > 1
          or port_str.count(':') < (port_str.count('T') + port_str.count('U'))
      ):
          return True
      return False
docs: Check if the port string is well formed.
      Return True if fail, False other case.