Type

Author: dsaxton

pandas/core/internals/managers.py

@@ -2,7 +2,17 @@
 import itertools
 import operator
 import re
-from typing import DefaultDict, Dict, List, Optional, Sequence, Tuple, TypeVar, Union
+from typing import (
+    DefaultDict,
+    Dict,
+    List,
+    Optional,
+    Pattern,
+    Sequence,
+    Tuple,
+    TypeVar,
+    Union,
+)
 import warnings
 
 import numpy as np
@@ -1907,7 +1917,10 @@ def _merge_blocks(
 
 
 def _compare_or_regex_search(
-    a: ArrayLike, b: Scalar, regex: bool = False, mask: Optional[ArrayLike] = None
+    a: ArrayLike,
+    b: Union[Scalar, Pattern],
+    regex: bool = False,
+    mask: Optional[ArrayLike] = None,
 ) -> Union[ArrayLike, bool]:
     """
     Compare two array_like inputs of the same shape or two scalar values