From: Jeff Schwab <jeff@...>
Date: 2009-02-21T01:19:45+09:00
Subject: Re: Un-escaping hexadecimal code

I単aki Baz Castillo wrote:

>   string = "%61lice"
>   string = eval %{ "#{ string.gsub(/%/,'\x') }" }
>   => "alice"
> 
> How could I avoid the usage of "eval" to un-escape the string?

s.gsub! /%(\d+)/ do |match|
   $1.to_i(16).chr
end
puts s

You might also consider supporting escaped % literals.