I am trying to delete all lines in a file that are not elements of my
list. I have a standalone test posted here

https://gist.github.com/1946826

The test populates /tmp/testfile with 3 lines
1
2
3

If you add a line that isnt one of those I want it to be deleted. It
seems that I am not doing my delete_lines regex correctly. I know there
are other ways to do similar namely edit_defaults => empty for the
specific test, but there might be instances I want to delete all lines
in a file that dont match a pattern.

Can someone help me figure out what I am doing wrong?

-- 
Nick Anderson <n...@cmdln.org>
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