Info This is the English translation of my original writeup. In PlaidCTF 2021, I solved the challenge The Watness III, then I spent my time on another challenge dr. Unfortunately, the regular expression algorithm in dr is too complex to understand, thus I failed to solve it. There was a similar challenge in PlaidCTF 2020, The Watness II, I solved that last year when I was a member of A*0*E, which was a reverse challenge of HyperCard game on the m68k platform.

今天杭州又是阴雨连绵的天气，实在叫人打不起精神。很久以前我就发誓要改掉拖延症的毛病，但是几年过去依旧没有什么改变，想起自己去年的DEF CON CTF 2020

这次的PlaidCTF中我解出了一道Reverse题目The Watness III，剩余的时间花在了另一道题目dr的逆向上，然而最后也没逆出来其中的正则表

发现已经一年没更新过博客了…过来填点坑。TCTF 2020从早上10点开始，持续24小时，我和队友们在108打了一整天，凌晨4点