Using awk printf to urldecode text

Question

I\'m using awk to urldecode some text.

If I code the string into the printf statement like printf \"%s\", \"\\x3D\" it correct

Answer 1

I don't know how you do this in awk, but it's trivial in perl:

echo "http://example.com/?q=foo%3Dbar" | 
    perl -pe 's/\+/ /g; s/%([0-9a-f]{2})/chr(hex($1))/eig'