The Match-end-of-line Operator (`$')
------------------------------------

  This operator can match the empty string either at the end of the
string or before a newline character in the string.  Thus, it is said
to "anchor" the pattern to the end of a line.

  It is always represented by `$'.  For example, `foo$' usually
matches, e.g., `foo' and, e.g., the first three characters of
`foo\nbar'.

  Its interaction with the syntax bits and pattern buffer fields is
exactly the dual of `^''s; see the previous section.  (That is,
"beginning" becomes "end", "next" becomes "previous", and "after"
becomes "before".)