Caaz

require_relative 'nim.rb'

nim = Nim.new
print "Please select board configuration: (0: [4,3,7], 1: [1,3,5,7]): "
choice = Integer(gets.chomp) rescue nil
while !(choice.match(/0|1/))
    puts "Invalid input"
    puts "Please select board configuration: (0: [4,3,7], 1: [1,3,5,7]): "
    choice = Integer(gets.chomp) rescue nil
end