Sunday expansion pack (1 point)

Hi, trainee,

unlock the secrets of regular expressions - a must for mastering the powergrid! Last Sunday, The Null Hypothesis Herald featured a crossword supplement where you can easily test your skills.

Stay grounded!

• Download the supplement

Hints

• Useful links
  • https://www.rexegg.com/regex-quickstart.html
  • https://regex101.com/
• All services in powergrid.tcc domain are accessible via VPN only.

Solution

The provided archive contains PDF with The Null Hypothesis Herald. Regex proficiency allows us to solve the crossword puzzle to reveal the address of some server.

The server hosts a website that immediately reveals the discount code flag.