append to non-blank lines in a selection

Given a text:

line1 has stuff
so does line 2

line 4 has more stuff
and line 5
and so on

I would like to select the text block and append a word to each
non-blank line. I can use a block selection and `A` to add to all
selected lines, but not sure how to only apply to lines that have
text.

PS I'm guessing I need to learn regular expressions, which confound me
to no end. Any pointers to good places to learn regex would be great!

c
--
Chris Lott <chris@chrislott.org>

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