Incidentally $ does match the end of paragraphs (as documented), but
seems to match the paragraph break (not just tne -position- at the end
of the paragraph), so paragraphs are merged forming a single new
paragraph.  Except only one of a group of successive empty paragraphs is
matched.

Matching the para-break itself seems odd to me (as usually unhelpful),
but might be intentional.  However the fact that only some empty
paragraphs are matched is almost certainly a bug.

EXAMPLE: In the following 1-line paragraphs, there are two empty paras between 
b and c (<P> indicates the paragraph symbol which is shown when displaying 
non-printing characters):
a<P>
b<P>
<P>
<P>
c<P>
Find-and-replace of $ with X replaces the 5 paragraphs with 2 paragraphs:
aXbX<P>
Xc<P>
As you can see, the 5 paragraphs were collapsed into two paragraphs, except the 
"paragraph break" was not removed for one of the empty paragraps.

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https://bugs.launchpad.net/bugs/465309

Title:
  [Upstream] Regular Expression Search for circumflex by itself does not
  find beginning of a paragraph

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