PWB error #1

urbanecm@tools-bastion-02 ~/tmp
$ python ~/pwb/scripts/replace.py -v -v --debug -simulate -ns:0 -regex -search:'ZOO' '(===*[^=]*)ZOO([^=]*=*==)' '\1zoo\2' 2>&1 | tee pwbZOO.log
Pywikibot r70771dd125ece9ae7917d69279d654b39e6bf80a
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2]
ERROR: Incomplete command line pattern replacement pair.
Found 1 wikipedia:cs processes running, including this one.
Dropped throttle(s).
Closing network session.
Network session closed.