rule for dimming all files if name ends with (or contains) ".jpg" or ".png" or ".jpeg" ".zip"

[filmgal]

The rules only allow for one character.
Would it be possible to use more characters, as indicated in my subject line?

[iOSonntag]

What does it mean to only allow one character, actually it should work with multiple characters. Can you not enter multiple oes? and if so does it not work with multiple ones?