You can use an advanced template to process column data with regex. See:
http://manual.calibre-ebook.com/template_lang.html
In this case, a
list_re()
Quote:
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list_re(src_list, separator, include_re, opt_replace) – Construct a list by first separating src_list into items using the separator character. For each item in the list, check if it matches include_re. If it does, then add it to the list to be returned. If opt_replace is not the empty string, then apply the replacement before adding the item to the returned list.
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This should work:
Code:
{tags:'list_re($,",","^[A-Z](.*)","\1")'}
to strip off the first capital letter of each tag.