@ original poster:
Quote:
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...Once again, what does Calibre runs search&replace on? Source book (in that case <img.*?> would work for epub, html) or some internal representation (in which case <img.*?> would work for everything)?
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It seems clear from that statement that you have not bothered to test that or any of the other suggestions offered by the experience of others here. One can conclude that your space situation cannot really be so desperate.