urldecode function or library for Unity?

Is there something like PHP’s urldecode() function for use in Unity? If not, are there better ways to write such a function without using bruteforce .Replace() based on all the url encodings possible?

If this doesn’t do it for you http://unity3d.com/support/documentation/ScriptReference/WWW.UnEscapeURL.html
then there are some examples of using Replace you can find by Googling