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  1. or download this
    use URL::Encode 'url_decode_utf8';
use utf8::all;
$string = '%E6%88%91%E7%88%B1c++';
print url_decode_utf8("$string");
  2. or download this
     ...
 $EncodeMap{"\x20"} = '+';
 ...
 $s =~ y/+/\x20/;