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48 years ago Lee E. McMahon designed a small but neat tool for parsing and transforming text. Until today it can be found on every POSIX system and at least some people like to use it as a CLI tool in connection with awk.

We are talking about sed. 

In fact sed is a stream editor and implements a small language. By the way, it was one of the first to support regular expressions. And what do you do when you're like Francisco Castro and you're looking for a new challenge?

Well, sure, you build a circuit simulator based on sed. 🤪

Francisco proves in detail here, that the whole thing is no joke. And even if the project sounds a bit crazy at first, it is more than interesting, at least if you like to peek beyond your own horizon.