Select files in ranger using ranger

I am a bit confused about using regex in ranger (Arch Linux). I have a folder of files that look like this:

'sometexthere - I. - sometexthere'
'sometexthere - II. - sometexthere'
'sometexthere - III. - sometexthere'

I want to select only the files with II. or III. in the middle. I have seen this post , and I have tried to mark all the files using mark and regex like so:

:mark * [II.|III.]*

which should match 'any characters' + 'space' + 'II.' or 'III.' + any character. However, it always selects all files including those with only one I. Can anyone help me out here? Cheers!