code: def test_replace(any_string_dtype):
      ser = Series(["fooBAD__barBAD", np.nan], dtype=any_string_dtype)
  
      result = ser.str.replace("BAD[_]*", "", regex=True)
      expected = Series(["foobar", np.nan], dtype=any_string_dtype)
      tm.assert_series_equal(result, expected)
  
imports: from datetime import datetime
  import re
  import numpy
  import pytest
  from pandas.errors import PerformanceWarning
  import pandas.util._test_decorators
  import pandas
  from pandas import Series, _testing
  from pandas.tests.strings import _convert_na_value, object_pyarrow_numpy
label_desc: Use image node_id 12 for calling a global function with example usage: test_replace(any_string_dtype) without return types