I linked to the EEL source code for escape sequences in your previous thread.
It's \r \n \t \b \<decimal number> and \x<hexadecimal number> (plus \<any char> for escaping).
For Lua the documentation for them is at
https://www.lua.org/manual/5.3/manual.html#3.1. It's \a \b \f \n \r \t \v \\ " \' \z \x<two hex digits> \<up to three decimal digits> and \u{<unicode code point in hex>}.