function to decode url percent encoding

[Xah Lee <xahlee@gmail.com>]

is there a function that decode the url percent encoding?

e.g.
http://en.wikipedia.org/wiki/Sylvester%E2%80%93Gallai_theorem

should become

http://en.wikipedia.org/wiki/Sylvester–Gallai_theorem

that's a EN DASH, unicode 8211.

but that just unhex, and generate gibberish if the url contain unicode
chars.

thanks.

  Xah
∑ http://xahlee.org/

☄