正则表达式经典实例

public static String regular(String possess, String fill){
        //正则表达式
        String csrf_token = null;
        BufferedReader in;
        Pattern pattern = Pattern.compile(possess);
        in = new BufferedReader(new StringReader(fill));
        String s;
        try {
            while ((s = in.readLine()) != null){
                Matcher matcher = pattern.matcher(s);
                if (matcher.find())
                {
                    csrf_token=matcher.group(1);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return csrf_token;
    }

 //获取csrf_token值（使用正则）
        csrf_token = LunTan.regular("name="csrf_token" value="(.+?)"/>", response);
        System.out.println("csrf_token:" + csrf_token);
        System.out.println("----------------------------------------");