Drag and drop is no different to using add. It will use your regular expression for a text file. However I notice you still had "Get metadata from file contents" ticked in a screenshot above, so if you drag/dropped an epub or mobi for instance it is going to use title/author metadata from inside the file, NOT evaluate your regex. If relying on filenames/regex is how you want to do your imports, then untick that other option.
Apologies if I missed it but I haven't seen you post the actual filename of the file you are drag/dropping. I see lots of screenshots of regexes and the result, but not what the actual name of the file is. If your "plan" for the regex was based on a flawed assumption then everyone's suggestions to tweak it aren't going to do any good...
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