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You want an "edit" plugin. The easiest way to get started on plugin writing is to play around with the testme3_v031.zip example plugin that is linked to in the first post of this very thread. There are examples in that plugin for iterating over all xhtml files in an epub, examples on how to use Quickparser to parse the xhtml, examples of using sigil gumbo to do the same, how to save file changes, and etc.
Give that a try first.
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