https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220924

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]

--- Comment #1 from [email protected] ---
(In reply to Joachim K from comment #0)
Per re_format(7): "A (modern) RE is one or more non-empty branches, separated
by `|'." It doesn't say that basic regular expressions differ in this respect,
so it looks like the empty string is not a valid RE and so there may be more
than one bug here.

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