Where do you find that?

kcott is right that I simply looked at the code's output, but it's also documented in Quote and Quote like Operators.

If I look at the ascii table I see that the escape key can be represented as: 27 (decimal), 1B (hexadecimal), 033 (octal).

Those work too: the string "\e" is the same as "\x1B" and "\033" - you can try this out yourself with eq.

In reply to Re^3: Capture a non-printable char and test what it is by haukex
in thread Capture a non-printable char and test what it is by almsdealer

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