Re: Which filter/action hook should I use?
Well you’d have to use an existing html tag like blockquote and map it to a bbcode tag via another plugin.
But blockquote can have made-up attributes.
<blockquote post="1824" author="_ck_">blah blah</blockquote>
But it’s much more simple to start with non-intelligent quoting. You can place the post reference but to look for it and analyse it is much more difficult.
Stripping nested blockquotes will be very easy.
Well fairly easy.