CBLT-202:  fix typo in regular expression

Change-Id: I224d91f1eb6c1d3f859c67d0b682ec56add272ff
Reviewed-on: http://review.couchbase.org/34707
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>