private void checkUnsupportedSymbolsProblem(@NotNull PsiExpression expression, int pos, char c) {
        if (c == '{' || c == '}' || c == '#') {
          holder.registerProblem(expression, ExpressionUtils.findStringLiteralRange(expression, pos, pos + 1),
                                 InspectionGadgetsBundle.message("inspection.incorrect.date.format.message.reserved.character", c));
        }
      }
private void checkUnsupportedSymbolsProblem(@NotNull PsiExpression expression, int pos, char c)