\"     double quote

       \NNN   character with octal value NNN (1 to 3 digits)

       \\     backslash

       \a     alert (BEL)

       \b     backspace

       \c     produce no further output

       \f     form feed

       \n     new line

       \r     carriage return

       \t     horizontal tab

       \v     vertical tab

       \xHH   byte with hexadecimal value HH (1 to 2 digits)

       \uHHHH Unicode (ISO/IEC 10646) character with hex value HHHH (4 digits)

       \UHHHHHHHH
              Unicode character with hex value HHHHHHHH (8 digits)

           \e      Write an <escape> character.
           \a      Write a <bell> character.
           \b      Write a <backspace> character.
           \f      Write a <form-feed> character.
           \n      Write a <new-line> character.
           \r      Write a <carriage return> character.
           \t      Write a <tab> character.
           \v      Write a <vertical tab> character.
           \'      Write a <single quote> character.
           \\      Write a backslash character.
           \num    Write an 8-bit character whose ASCII value is the 1-, 2-,
                   or 3-digit octal number num.