removing extension on a file

I've got a page that uploads a zip file. The name of the file is being captured via cffile.clientfile, and of course includes the ".zip" extension in its name. Since I'm unzipping the file and accessing the newly created folder, (same name as the zip file), I need the captured name to be deleted of it's .zip extension within the cffile.clientfile variable. Possible? I'm guessing I have to get the full name with cffile.clientfile and then use some regex or something? Any sample code?