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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".)
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