The anonymous regex could be better written: $data =~ s/%[0-9a-fA-F]{2}/pack('c', hex($1)/eg; I believe.

The difference is that, his first translates all + characters into spaces. His also only grabs two valid hexadecimal characters following a percentage sign, while your regex matches two of any characters (besides a new line) following a percentage sign. It's probably better to be more specific. Still, btrott is right. Using CGI.pm is the way to go.

In reply to The Difference by chromatic
in thread Cleaning up CGI input Data by Anonymous Monk

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