Run the scan again. When you get the list of files, move your mouse over the item you want to work on, then click the right-hand mouse button. A menu will be displayed which will give you the options you need.
When I run into this problem, I usually edit the movie that's causing the problem and set the filename manually.
If you want to try to fix the REGEX, you'll need a 'Regular Expression Parser'. I think there's one in the download section of this site. What I guess is happening, is the regex is matching something in your filename (other than or along with the title). You'll need to know what the regex is returning in order to fix it. That's probably the easy part. Regex is messy to work with.
