Thank you for comment.
The content that I taught was very helpful.
I think that I will investigate a little more based on the contents received, but basically it seems difficult.
(If it can, it seems to be something that is not quite universal)
Basically I will expect the product to support input of URI.
Thank you for various responses.
Seems like a good suggestion should be to have that particular check disabled if the post downcase = upcase then, right? Maybe not perfect, but it would catch all-character posts like the above.