code: def test_stopwords_regex(self):
      text = "The quick brown fox jumps over the lazy dog."
      stopwords_regex = "( [a-zA-Z]{1}ox | [a-z]{1}og|(brown)|[a-zA-z]{1}he)|[a-z]{2}mps "
  
      augs = [
          nac.RandomCharAug(
              action="delete", stopwords_regex=stopwords_regex
          ),
          nac.KeyboardAug(stopwords_regex=stopwords_regex),
          nac.OcrAug(stopwords_regex=stopwords_regex),
      ]
  
      for aug in augs:
          for i in range(10):
              augmented_data = aug.augment(text)
              augmented_text = augmented_data[0]
              self.assertTrue(
                  "quick" not in augmented_text
                  or "over" not in augmented_text
                  or "lazy" not in augmented_text
              )
  
file_path: nlpaug/test/augmenter/char/test_char.py
imports: import unittest
  import nlpaug.augmenter.char
  import nlpaug.util.text.tokenizer
  from nlpaug.util import Action
label_desc: Use image node_id 7 for calling the TestCharacter obj's underlying member method code with example usage: obj.test_stopwords_regex() without return types