If you already know what regular expressions are, feel free to skip ahead. For those who are still reading this, in a nutshell, regular expressions are quick and simple programs used for searching text within a document. As an example- If you are looking for all the phone numbers/email ids in a document, then Ctrl/Cmd + F won't help you. In such situations, regular expressions are the tool to use.
It doesn't matter if you just want to get your feet wet or are a pro looking to brush up, play along and enjoy the tale of Agent Brown, an ex spy who tries to stop a nefarious entity from bringing the internet down.
Instructions
If you are unsure, just look at the hints at the bottom or pause the game and re-review the lesson.
Each level could be potentially solved using multiple regexes and you are free to choose your style, in the end we only evaluate the results obtained by running the regex.
There's a timer associated with each level. But even if it runs out, game resumes from the same level again. Basically nothing bad happens. Trying to solve within the given time limit is the challenge.
Beginner:
If you are not familiar with RegEx at all then don't worry, each level is preceded by a lesson to help you.
The timer may run out on you a couple of times and it is fine, just try to finish the whole thing without thinking too much about the timer.
You are even encouraged to maybe break the whole game into multiple small sessions, each level can be skipped so that when you come back next time, you can start from where you left off.
You don't have to memorize all the concepts at all. Once you are aware of the possibilities, then you can always look stuff up over the internet. Purpose of this is to get you familiarized with the idea.
Intermediate:
Expectation is that you'd be able to finish the whole thing without the timer running out on you.
Advanced:
Let's see if you can get each level right in the first attempt.