FizzBuzz with Regexes

refizzbuzz.rb

#!/usr/bin/env ruby

@parts = ''
(0...100).each { |i| @parts += ',' + (i + 1).to_s }

def mark(n, label)
  @parts.gsub! /((,\w+){#{n - 1}})(,\w+)/, "\\1,#{label}"
end

mark 3, 'Fizz'
mark 5, 'Buzz'
mark 15, 'FizzBuzz'

puts @parts.split(',')[1..-1]