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Chapter detection, by its very nature needs to match tags, not random regexps. In fact for links to chanpters to work the tags must be block tags like heading, div or p. Or anchors.
That is why the options use XPath.
If you are asking for a generic regexp pre-processing option, that can be done (though really I would suggest using the conversion debug option, then using whatever regexp tool you like (I prefer vim) on the files in the input directory. zip up the input directory and have calibre convert that.
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