It was spoken:

 Or instead of subs on each one of the special values (like %20, or %2B), you can try this:

s/%(..)/pack("C", hex($1))/eg;
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Actually, forget the above and go with CGI.pm. Its much easier...

Arrrgh! Please, any code that uses pack there was written in the Perl4 days, before we had chr in Perl5. Are you PurlGurl? :)

And of course, the proper thing is yes, use CGI.pm, please.