7.5 Control Characters

These escape codes can be used to match control characters:

        \b              backspace
        \f              formfeed
        \n              newline
        \r              carriage return
        \s              space
        \t              tab 
        \e              ESC (escape)
        \ddd            the literal oct number 0ddd
        \xddd           the literal hex number 0xddd
        \^C             Control code. E.g. \^D is "Ctrl-D"