@Override
    protected void applyFix(@NotNull Project project, @NotNull PsiElement element, @NotNull ModPsiUpdater updater) {
      if (!(element instanceof PsiLiteralExpression expression)) {
        return;
      }
      final String text = expression.getText();
      final StringBuilder newExpression = new StringBuilder();
      int length = text.length();
      for (int i = 0; i < length; i++) {
        char c = text.charAt(i);
        if (StringUtil.containsChar(REGEX_META_CHARS, c)) {
          newExpression.append("\\\\");
        }
        newExpression.append(c);
      }
      PsiReplacementUtil.replaceExpression(expression, newExpression.toString());
    }
@Override
    protected void applyFix(@NotNull Project project, @NotNull PsiElement element, @NotNull ModPsiUpdater updater)