fix regex in test_black.py
diff --git a/tests/test_black.py b/tests/test_black.py
index 3d5d3982817..4267c6110a9 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -31,7 +31,7 @@
 
 import click
 import pytest
-import regex as re
+import re
 from click import unstyle
 from click.testing import CliRunner
 from pathspec import PathSpec
@@ -70,7 +70,7 @@
 R = TypeVar("R")
 
 # Match the time output in a diff, but nothing else
-DIFF_TIME = re.compile(r"\t[\d-:+\. ]+")
+DIFF_TIME = re.compile(r"\t[\d\-:+\. ]+")
 
 
 @contextmanager

Trying to get rid of the regex dependency, but found instead that we were incorrectly using a character range in this regex.