psql method (initcap and also keep Roman number capitalized)

Emi <[email protected]> Fri, 27 Apr 2018 10:39:54 -0400

Newsgroups	gmane.comp.db.postgresql.sql
Message-ID	<[email protected]>

Hello,

May I know is there a psql method that can do similar to initcap, and 
could also keep Roman numbers (II, IV, VI, etc) to be capitalized please?

For example, string shows "Title II" but not "Title Ii".

Thanks a lot.

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