windows 10 - Bulk move via CMD Regex

I have about 15k files in a flat folder. All are named something like blah blah - whatever.png. Basically, I'd like to move them all into folders named blah blah. I don't want to rename any of them, just bump them into their respective folders. I imagine I need to do this with some kind of regex, but I can't seem to workout how to apply regex in this context.

Answer

The for command does not support regular expressions.

Assuming all files contain a - character, you could probably use this code in a batch file:

for /f "delims=- tokens=1* usebackq" %%a in (`dir /b *.png`) do (
    if not exist "%%a" mkdir "%%a"
    move "%%a-%%b" "%%a"
)

delims=- will split the filenames on -, giving you the directory name which will be created if it doesn't exist yet. Next, the original filename, %%a-%%b, will be moved to that directory.