that is self defeating, I want to make the change so that lines can be split on either side of the ndash ( once converted to Kindle) if needs be - a non breaking space either side would prevent that I assume.
other search / replace engines ( e.g. sigil) support leading / trailing spaces - they are somewhat essential when using regex to remove unwanted line feeds. as you need constructs like space\1 in your replace box.
it would be MUCH faster to do a single find+replace & epub to epub convert in calibre that it is to go to sigil, set it to code view, set its find /replace to all files, all instances & then make the changes that way, but if leading trailing space cant be used....
& I guess there are other valid reasons for wanting to add extra ( normal) space via the search / replace engine
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