Use re instead of regex

packaging/torchtext/meta.yaml

@@ -23,7 +23,6 @@ requirements:
     - python
     - requests
     - tqdm
-    - regex
     {{ environ.get('CONDA_PYTORCH_CONSTRAINT') }}
 
 build:

torchtext/transforms.py

@@ -1,9 +1,9 @@
 import json
+import re
 from copy import deepcopy
 from functools import lru_cache
 from typing import Any, List, Mapping, Optional, Sequence, Tuple, Union
 
-import regex as re
 import torch
 import torchtext  # noqa: F401
 from torch import Tensor