@abc.abstractmethod
    def get_router_choices(self, request, kwargs):
Returns list of words found in String. Matches A-Za-z and 's
dataset/ETHPy150Open openstack/horizon/openstack_dashboard/dashboards/project/firewalls/forms.py/RouterInsertionFormBase.get_router_choices--crossover with--dataset/ETHPy150Open daeilkim/refinery/refinery/refinery/data/models.py/tokenize_sentence