code: def test_string_contains(self):
      self.check_func(lambda x: x.str.contains("le", regex=False))
      self.check_func(
          lambda x: x.str.contains("White", case=True, regex=False)
      )
      self.check_func(
          lambda x: x.str.contains("apples|carrots", regex=True)
      )
      self.check_func(
          lambda x: x.str.contains(
              "BANANAS", flags=re.IGNORECASE, na=False
          )
      )
  
imports: import pandas
  import numpy
  import re
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 30 for calling the SeriesStringOpsMixin obj's underlying member method code with example usage: obj.test_string_contains() without return types