iterator.rb

def iterate_over_pages pattern
  page = 1
  loop do
    url = pattern.gsub(/%page%/, page.to_s)
    break unless yield url, page
    page += 1
  end
end

iterate_over_pages("http://leplay.com.ua/category/pic/page/%page%/") do |url, page|
  puts url
  4.times do |i|
    puts i
    if page == 3 && i == 3
      break
    end
  end
end

def iter_over_pages url
  loop do
    result = yield url
    result ? url.next! : break
  end

end

iter_over_pages("http://leplay.com.ua/category/pic/page/1/") do |url|
  10.times do |i|
    p i
    break if url.match(/(\d+)\/$/)[1].to_i == 10 && i == 4
  end
end