AttributeError: module 'regex' has no attribute 'Pattern'

AttributeError Traceback (most recent call last)
in ()
----> 1 from espnet2.bin.tts_inference import Text2Speech
2 from espnet2.utils.types import str_or_none
3
4 text2speech = Text2Speech.from_pretrained(
5 model_tag=str_or_none(tag),

9 frames
/usr/local/lib/python3.7/dist-packages/nltk/tokenize/casual.py in TweetTokenizer()
366
367 @property
--> 368 def PHONE_WORD_RE(self) -> regex.Pattern:
369 """Secondary core TweetTokenizer regex"""
370 # Compiles the regex for this and all future instantiations of TweetTokenizer.

AttributeError: module 'regex' has no attribute 'Pattern'