StringBuffer sb = new StringBuffer("");
        sb.append("test \r\n");
        sb.append("<%  \r\n");
        sb.append("a=\"asfdsaf%\"  \r\n");
        sb.append("response.write a  \r\n");
        sb.append("%>  \r\n");
        sb.append("tttt  \r\n");
        sb.append("<%  \r\n");
        sb.append("b=\"2323423sdfasdf2\"  \r\n");
        sb.append("response.write b  \r\n");
        sb.append("%>\r\n");

        Pattern p = Pattern.compile("<%(.|\r\n)*?(?=%>)%>");
        Matcher m = p.matcher(sb.toString());
        
        while(m.find()){
            System.out.println("1: "+m.group(0));
        }

------解决方案--------------------
大菜鸟  果然不同凡响   呵呵  
正则很厉害啊  
佩服