Rocket:
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...
using regex "
" it turns the output is all on one line:

one,two,three,four,five

which is almost the goal, however I don't know how to tell regex to ignore blank
lines so the output will look like:

one,two,three,
four,five

or

one,two,three,

four,five

Thanks - Rocket
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Depending on the supported features of your editor, you could use negative
lookbehind, e.g.
(?<!\n)

i.e.: search for a newline, not preceded by a newline

or as another solution, you can simply replace
,

with 
,

(assuming, there isn't any whitespace in between and there is a newline after
the last comma)
This second approach is also doable with the addons for PSPad mentioned above.

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