docs: public static String delKeyword(String target, String rules){
  		Pattern p = Pattern.compile(rules); 
  		Matcher m = p.matcher(target); 
  		StringBuffer sb = new StringBuffer(); 
  		boolean result = m.find(); 
  		while(result) { 
  			m.appendReplacement(sb, ""); 
  			result = m.find(); 
  		}
  		m.appendTail(sb);
  		String s = sb.toString();
  		//System.out.println("字符串："+target+" 的处理后字符串为：" +sb);
  		return s;
  	}