In the time-honoured tradition of TMTOWTDI, if you replace
if ( $key eq "\e" ) {
print "Escape pressed\n";
}
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";
}
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.
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