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我需要将 %xx 十六进制字符更改为字符。我正在尝试使用此代码，但它不起作用：

#!/usr/bin/perl -w

my $cadena = "%40%61%62";
print $cadena."\n";
$cadena =~ s/%//g;
print "cad: ".$cadena."\n";
my $string =~ s/([a-fA-F0-9][a-fA-F0-9])/chr(hex($1))/eg;
print "traducida: ".$string;