finding all newlines NOT followed by 5 numbers and a comma

I am looking for a regular expression to remove any newline
character
that is not followed by 5 numbers and a comma.

Here is what I currently use, but if my dataset were to
contain the
example below (which it might someday) then this expression
won't work.

Find: \n\([^0-9]\)
Replace: \1

This currently finds a newline followed by any non-numerical
character

What will work?

Example CSV Data File:

10398,400000,"Bookmark.................
10398,400000,"Poster.................

1<P>Measures

<1P>1v
17 x 23"". Non-laminated."
sdfsdf
10399,400000,"Reading Certificate.............

Thanks for your help!

- JS


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