I imported both Jpeg and raw files from my memory card, and now would like to purge all the jpegs. I thought, well there's the handy little selector up in the filter bar which let's you chose between "image" and "raw". If I click raw, it only shows me the raws. So I would expect that if I click "Image" that I would see only the NON RAW pictures. But no, that just shows me everything.
If I type ".jpg" or ".jpeg" into the search bar, it shows zero results.
Is this the cloud version of Lightroom? If so, type "jpg" in the search bar (no quotes) and it should show you all jpegs. It works in my installation. It is supposed to search filenames too which is why this works. It also works for me when I type .jpg so not sure why that doesn't work for you.