The manual says this:
Quote:
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In the Search & replace part, you can input a regexp (short for regular expression) that describes the string that will be replaced during the conversion. The neat part is the wizard. Click on the wizard staff and you get a preview of what calibre “sees” during the conversion process. Scroll down to the string you want to remove, select and copy it, paste it into the regexp field on top of the window.
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What "wizard staff"? What preview? Perhaps this description refers to an older version of Calibre, but the interface has been updated since.