Wrote a simplified regular expression parser to make life easier (it only does single matches; i.e., no one-or-more matches, etc.).

Fixed some of the whitespace/line break matching.

test.yaml

@@ -1,3 +1,5 @@
+---
 - milk
-- eggs
-- cheese and bread       # this is really important!
+- eggs             # this is really important!
+- cheese and bread
+...