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I was doing a problem today that required me to extract the number from a URL in javascript. After some research, it seemed Regex was the best way to accomplish the task. I then soon realized I had to do some review on regular expressions and how they work. So, I decided to do the hackerrank problems at https://www.hackerrank.com/domains/regex so that I can leverage the power of regular expressions for any future tasks. I have done many of the ‘easy’ difficulty problems so far and I already feel...