- This pattern, "\R(^\h*?\R)+", meant to find all contiguous non text lines,
fails if there is no following text line. IOW, if the end of the document
consists only of white space and line terminators, the pattern fails. If
any non-white space character is added at the end, the pattern succeeds.
Note that the pattern is greedy. (Tested in NTS 5.8/fv & 6.2/fv)