urldecode

   1 #f5# RFC 2396 URL encoding in Z-Shell
   2 emulate -L zsh
   3
   4 setopt extendedglob
   5 input=( ${(s::)1} )
   6 print ${(j::)input/(#b)([^A-Za-z0-9_.!~*\'\(\)-])/%${(l:2::0:)$(([##16]#match))}}