Re: sed --posix

[Karl Berry]

    \| is treated like |, matching a literal | (traditional behavior)
    \| is treated as an alternation operator (GNU behavior)
    \| is an error (my preference)

    My claim that sed has a bug is that you chose the first behavior without
    - --posix

Oh?  I am seeing that \| is treated as the alternation operator without
--posix:

$ echo bar | sed 's/foo\|bar/baz/'
baz
$ sed --version
GNU sed version 4.2

And I am very glad about that!