It looks like you are dealing with URL-encoded data. The URI::Escape module can deal with this:
use URI::Escape;
# ...
$data = uri_unescape($data);
This should change %20 (in the $data variable) into spaces (assuming you are running on an ASCII-compatible platform),
and other %XX sequences into the appropriate character.
If you really don't want to use a module you can use the substitution:
$data =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg
which should be equivilent.
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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