/usr/lib/s9fes/help/url-decode is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | S9 LIB (url-decode string) ==> string
Decode an URL-encoded string. In an URL-encoded string, each subsequence
of the form %NN represents a character with the ASCII code NN, where NN
is a two-digit hexa-decimal number. URL-DECODE creates a fresh string
where each %NN sequence has been replaced by the corresponding character.
When STRING contains invalid %NN sequences, URL-DECODE returns #F.
(url-decode "%46%4F%4FBAR") ==> "FOOBAR"
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