mik-laj commented on a change in pull request #15582:
URL: https://github.com/apache/airflow/pull/15582#discussion_r623146456
##########
File path: airflow/utils/helpers.py
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@@ -31,10 +31,17 @@
from airflow.exceptions import AirflowException
from airflow.utils.module_loading import import_string
+if TYPE_CHECKING:
+ from airflow.models import TaskInstance
+
KEY_REGEX = re.compile(r'^[\w.-]+$')
+CAMELCASE_TO_SNAKE_CASE_REGEX = re.compile('(?!^)([A-Z]+)')
Review comment:
```suggestion
CAMELCASE_TO_SNAKE_CASE_REGEX = re.compile(r'(?!^)([A-Z]+)')
```
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