[Bug 257587] security/logcheck: Regex error "egrep: empty (sub)expression"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257587

            Bug ID: 257587
           Summary: security/logcheck: Regex error "egrep: empty
                    (sub)expression"
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: hagen.bauer@caserio.de
                CC: yasu@utahime.org
                CC: yasu@utahime.org
             Flags: maintainer-feedback?(yasu@utahime.org)

I installed the package with the logfiles auth.log. When running logcheck I get
the message

sudo -u logcheck logcheck
egrep: empty (sub)expression

The logfile is there, contains logs and looks normal.

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