space_en_ch.rb

#! /usr/bin/env ruby
str = $stdin.read
if RUBY_VERSION < '1.9'
  print str
  exit
end

str.force_encoding 'utf-8'
str.gsub! /(\p{Han})([a-zA-Z0-9\(\)\[\]\{\}])/u do
  "#$1 #$2"
end
str.gsub! /([a-zA-Z0-9\(\)\[\]\{\}])(\p{Han})/u do
  "#$1 #$2"
end
print str