my calibre is tied up right now or I'd actually try this, but... a regex like this might work:
find the books to update:
Code:
tags:"~\b\d\d-\d\d\b"
search field: tags
find:
Code:
^(.*?)((\b\d\d-\d\d\b))+(.*?)$
replace:
into:
The comma will force an empty tag at the end, but that should fall off (empty tags disappear automatically).
This should be nondestructive to the original tags. After your satisfied it works,
search field: tags
find:
replace:
(i.e. replace with nothing)
should strip the age tags. Or you could go into the tag manager and manually select them, then remove from there.