Sum all numbers found in the input

total_numbers.rb

#!/usr/bin/ruby

decimal = "."
separator = ","

if RUBY_VERSION.to_f > 1.9
  Encoding.default_external = Encoding::UTF_8
  Encoding.default_internal = Encoding::UTF_8
  input = STDIN.read.force_encoding('utf-8')
else
  input = STDIN.read
end

def esc(char)
  return "\\#{char}"
end

total = 0
places = 0

input.scan(/(\-?[\d#{esc(separator)}]+(#{esc(decimal)}\d+)?)\b/).each {|x|
  total += x[0].gsub(/#{esc(separator)}/,'').sub(/#{esc(decimal)}/,'.').to_f
  places = x[1].length - 1 if x[1] && x[1].length.to_i > places + 1
}

puts input.chomp
out = "\n%.#{places.to_i}f" % total
puts out.sub(/\./,decimal)