String#undump

string.rb

class String
  def undump
    self.sub(/\A"/, '').sub(/"\z/, '').gsub(/\\(x([0-9a-f]{2})) | \\(u\{([0-9a-f]{4})\}) | \\(.) /ix)  {
      if $1 # \xXX
        [$2.hex].pack("C")
      elsif $3 # \u{xxxx}
        [$4.hex].pack("U")
      else # \.
        case $5
        when 't'
          "\t"
        when 'v'
          "\v"
        when 'n'
          "\n"
        when 'r'
          "\r"
        when 'f'
          "\f"
        when 'b'
          "\b"
        when 'a'
          "\a"
        when 'e'
          "\e"
        when 's'
          " "
        else
          $5
        end
      end
    }
  end
end