JSON ストリング

1 "
2? 
2 Any UNICODE character except " or ¥ or a control character
2? 
2 \
2 “ (quotation mark)
2 ¥¥ (backslash)
2 / (forward slash)
2 b (backspace)
2 f (formfeed)
2 n (newline)
2 r (carriage return)
2 t (horizontal tab)
2 u (4 hexadecimal digits)
3 "