AS3 + Eval-like function?

So I have a string of text, but within this text I want to input a variable at a specific portion of the text. Now this string of text is taken from an XML file. So the XML file would look like this for example:

        <desc>"This is a text"+temp.alias+"hey"</desc>

The <desc> is an example of a way I tried to make it work. What I want to happen is when I display the desc in my flash file, it inputs the alias (which in the xml is the name) of the item. In PHP this could be doing using EVAL() but I notice the support for that type of function is removed in AS3. Any help?