如何在Ruby中的另一个字符串之后匹配和迭代一个字符串

Question

I have a string like:

"abc-12\nxyz-17\nabc-18\npqr-13\n"

I want to match the number after each string and sum them all up. For example, I want to sum 12 and 18 for abc . How do I go about this?

Answer 1

"abc-12\nxyz-17\nabc-18\npqr-13\n".split("\n").inject(0) do |sum, line|
  sum += line[/[\w]+(\d)+/].to_i
end

Answer 2

s = "abc-12\nxyz-17\nabc-18\npqr-13\n"

s.split.inject(Hash.new(0)) { |h,e| id, n = e.split('-'); h[id] += n.to_i; h }
=> {"abc"=>30, "xyz"=>17, "pqr"=>13}