docs: private static String loadtxt(String path){
  		String rules = "";
  		try {		
  			InputStreamReader  read = new InputStreamReader (new FileInputStream(path),"utf-8");
  			BufferedReader bin = new BufferedReader(read);
  			String _ruleunit = bin.readLine();
  			while (_ruleunit!=null)
  			{
  				if (!_ruleunit.startsWith("-"))
  				{
  					if(rules.equals(""))
  						rules=rules+"("+_ruleunit+")";
  					else
  						rules=rules+"|("+_ruleunit+")";
  				}	
  				_ruleunit=bin.readLine();
  			}
  		}catch(Exception e){
  			System.out.println("正则表达式文件未找到！");
  		}
  		return rules;
  	}