niquepa

  def youtube_id(youtube_url)
    regex = /(?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/
    match = regex.match(youtube_url)
    if match && !match[1].blank?
      match[1]
    else
      nil
    end
  end
  

niquepa

Introduction to the problem
 
You are free to implement any mechanism for feeding input into your solution. You should provide sufficient evidence with unit tests that your solution is complete. As a minimum, please use the provided test data to indicate that the solution works correctly. Any programming language can be used to solve the problem.
 
Drawing tool
 
You're given the task of writing a simple console version of a drawing program. At this time, the functionality of the program is quite limited but this might change in the future. In a nutshell, the program should work as follows:
 
Create a new canvas
Start drawing on the canvas by issuing various commands