Not sure if this is helpful or not but for rot13, there is Crypt::Rot13 on CPAN. Just a reminder to check CPAN for everything first....
Now my code would be simpler:
my $x = ...
my %hash = map { s/(^'|'$)// } split /(:|, )/ $x;
That assumes you want something like
%x = ( a => 'n', b => 'o', ...);
But it also looks trivial to convert this to valid json and use that module
Update: On second thought that above approach won't work. I think you will need to do something like:
my $x = ...
my %hash = map { my $v = $_; $v =~ s/(^'|'$)//; $v} split /(:|, )/
+ $x;
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