"this string
contains a newline"
"
"

    "this is an indented string
    that contains a newline"

"this string contains a nul: $x{00}"
"this string contains a nul $x{00} in the middle"
"$x{00}"

"this string contains some other non-graphic character: $x{01}"
"this is graphic but non-ASCII space: $u{00A0}"