Pre*_*rem -1 ruby ruby-on-rails data-structures
我有字符串"A3B2C3D4" 它应该在输出中打印如下
AAABBCCCDDDD
如何在红宝石中实现这一目标？
"A3B2C3D4".scan(/(\D+)(\d+)/).map { |c, i| c * i.to_i }.join
#? "AAABBCCCDDDD"