In the time-honoured tradition of TMTOWTDI, if you replace 

    if ( $key eq "\e" ) {
        print "Escape pressed\n";
    }

[download]

with

    if (
           $key eq "\e"
        && $key eq "\x1b"
        && $key eq "\033"
        && $key eq "\c["
        && $key eq "\x{1b}"
        && $key eq "\o{33}"
        && $key eq "\N{ESCAPE}"
        && $key eq "\N{U+001B}"
        && $key eq v27
        && ord($key) == 27
        && ord($key) == 0x1b
        && ord($key) == 033
        && ord($key) == 0o33
        && ord($key) == 0b11011
    ) {
        print "Escape pressed\n";
    }

[download]

you'll get the same result.

I don't claim that's a non-exhaustive list of all possibilities, but I think it's pretty close.

You can find references to all of those in one or more of: perlop; perldata; perlrebackslash.

— Ken

In reply to Re^5: Capture a non-printable char and test what it is by kcott
in thread Capture a non-printable char and test what it is by almsdealer

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