…unless you click on the Aa icon.
For example, !\[image\]\([A-ZÁÉÍÓÖŐÚÜŰÆÐŊĦJŁ] should only find strings in a markdown link that start with a capital letter. (I use this to check for image links missing my assets/ prefix.)
You need to press Aa to have the proper results come in, if any.
It is not what I’d call a ‘bug’ but something that is unfortunate the way it is.