code: def test_string_replace(self):
      self.check_func(lambda x: x.str.replace("a.", "xx", regex=True))
      self.check_func(lambda x: x.str.replace("a.", "xx", regex=False))
      self.check_func(
          lambda x: x.str.replace("ing", "0", flags=re.IGNORECASE)
      )
  
      # reverse every lowercase word
      def repl(m):
          return m.group(0)[::-1]
  
      self.check_func(
          lambda x: x.str.replace("[a-z]+", repl, regex=True)
      )
      # compiled regex with flags
      regex_pat = re.compile("WHITESPACE", flags=re.IGNORECASE)
      self.check_func(
          lambda x: x.str.replace(regex_pat, "---", regex=True)
      )
  
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 19 for calling the SeriesStringOpsAdvMixin obj's underlying member method code with example usage: obj.test_string_replace() and returns: m