Update rasa_nlu/featurizers/regex_featurizer.py
Update rasa_nlu/featurizers/regex_featurizer.py

Co-Authored-By: paulaWesselmann <5ecb0b78cc018ddc7e78fb432d232fdf162e1774@users.noreply.github.com>
RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu