Tomorrow a new type of contest will be hosted on HackerRank. It's going to be all about regular expressions - a concept that all software engineers should be aware of.
The contest duration is set to 24 hours and top 10 participants will be awarded with HackerRank T-Shirts. I created two problems there and I'm going to take care of user questions during the contest. As a hint, I can tell you that most problems are not hard if you are familiar with regular expressions already, so speed will be a big factor here.
Have fun with it and see you on leaderboard!