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The filenames are all numbered in sequence, so there is no chance to identify a picture by its name.
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I don't use Sigil so I don't know its behavior but I had the problem a few times and Calibre helped me out. There was no way to differentiate the images with regex so I used a regex that would find every image and just stepped thru every one. At each found image, Calibre selected the code and showed me the image in the preview pane. For most images, pass. For the fleuron, "Replace and Find."
Not elegant, but sounds like much less effort than what you described.