#!/usr/bin/env ruby

(0...1114112).each do |i|
  next if (0xD800..0xDFFF).include?(i) # surrogate area
  str = [i].pack('U*')
  if str.match(/[[:space:]]/)
    p [i, str]
  end
end

__END__

# output as follows:

[9, "\t"]
[10, "\n"]
[11, "\v"]
[12, "\f"]
[13, "\r"]
[32, " "]
[133, "…"]
[160, " "]
[5760, " "]
[8192, " "]
[8193, " "]
[8194, " "]
[8195, " "]
[8196, " "]
[8197, " "]
[8198, " "]
[8199, " "]
[8200, " "]
[8201, " "]
[8202, " "]
[8232, "\u2028"]
[8233, "\u2029"]
[8239, " "]
[8287, " "]
[12288, "　"]