Error when importing torchtext: "No module named 'regex'"

[seemethere]

We're observing errors on torchtext when attempting to import wheels due to a missing dependency.

Error looks like:

ERROR conda.cli.main_run:execute(41): `conda run python -c import torchtext; print('package version is ', torchtext.__version__)` failed. (See above for error)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/__w/_temp/conda_environment_3282699477/lib/python3.7/site-packages/torchtext/__init__.py", line 12, in <module>
    from . import data, datasets, prototype, functional, models, nn, transforms, utils, vocab, experimental
  File "/__w/_temp/conda_environment_3282699477/lib/python3.7/site-packages/torchtext/models/__init__.py", line 1, in <module>
    from .roberta import *  # noqa: F401, F403
  File "/__w/_temp/conda_environment_3282699477/lib/python3.7/site-packages/torchtext/models/roberta/__init__.py", line 1, in <module>
    from .bundler import (
  File "/__w/_temp/conda_environment_3282699477/lib/python3.7/site-packages/torchtext/models/roberta/bundler.py", line 13, in <module>
    import torchtext.transforms as T
  File "/__w/_temp/conda_environment_3282699477/lib/python3.7/site-packages/torchtext/transforms.py", line 6, in <module>
    import regex as re
ModuleNotFoundError: No module named 'regex'

Issue was introduced in #1946 and was fixed for conda but not fixed for wheels