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This isn't really an epub issue. There is no standard name or heading for a "chapter", or even need to have chapters at all, or have names / titles / headings in the text.
A keyword approach will fail on many ebooks.
It's convention to regard each file as either a front matter section, main body (optionally chapters) and end matter section. But an ebook also might have front matter, body, end matter etc all in one file.
The only 100% accurate method to delete all but main content is to look at the epub in an epub editor. You need to do it on a copy!
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