To apply a character style?
It is valid to create a sequence like \I\II\III\IV\, etc, until XXI?
Or this is a weird thing for the search engine?
ps: In spanish it is possible isolate special elements as I+i, as this combination does not exist as a character alone in the writing.
Obviously, each language has exeptions.
Live in spanish is vivir, for example. This grep will catch some minor exceptions (vi, vil, vid, vi, mil, etc)