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As far as the global replace does, you may wish to consider moving over to calibre's new ebook-edit feature. As Sigil is no longer being maintained, it is rather difficult to get new features, whereas Kovid is very active in maintaining calibre.
The important thing to consider is this: from the beginning calibre ebook-edit has had a very cool feature, it is called global undo-redo. Every time a global action is done, a checkpoint is created allowing you to roll back those changes. And you can manually create checkpoints too.
It is not fully done yet, but the editor has had all the basic functionality added already, and soon we will have saved searches, clips, a formatting toolbar, and all kinds of Sigil goodies! As soon as Kovid gets a chance to code them. He started work less than 2 months ago, so what we have already is huge, considering.
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