[erlang-questions] Url decoding

[Carlo Bertoldi]

Hello again,
  I believe this is a quite common problem, but I couldn't find an 
answer to my problem.
I'd like to URL encode/decode strings.
Encoding: edoc_lib:escape_uri("hello hello"). Perfect, but how can I go 
back to the original string now?
Is it possible to do it without using external libs, as those found in 
Yaws, or ibrowse? or I'll have to include one of those in my project?

Cheers,
  Carlo