Characters with special escaping are as follow :

: double-quote (`"`)
:: Escaped by prefixing with a backslash (`\`)

: backslash (`\`)
:: Escaped by prefixing with a backslash (`\`)

: bell (`0x07`)
:: Escaped as `\a`

: backspace (`0x08`)
:: Escaped as `\b`

: tabulation (`0x09`)
:: Escaped as `\t`

: line feed (`0x0a`)
:: Escaped as `\n`

: vertical tabulation (`0x0b`)
:: Escaped as `\v`

: form feed (`0x0c`)
:: Escaped as `\f`

: carriage return (`0x0d`)
:: Escaped as `\r`

Additionally, specific bytes can be specified using hex-mode, that is `\x`
followed by its hexadecimal code. (For example, byte 127 would be escaped as
`\x7f`).

Anything else will be treated as-is.