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    (undef, $userid) = split(qr{(?:/|\\)}, $ENV{'REMOTE_USER'});
  2. or download this
    # Alternation with non-capturing clustering (?:foo)
(undef, $userid) = split(qr{(?:/|\\)}, $ENV{'REMOTE_USER'});
...

# Character class including '\' and '/'
(undef, $userid) = split(qr{[\\/]}, $ENV{'REMOTE_USER'});