The Unicode standard assigns each code point (character) into one script. A script is a group of code points used by a particular human writing system. Some scripts such as Greek correspond to a single language. Other scripts like Latin conver multiple languages.
j.l.Character will make unicode scripts available via the proposed j.l.C.UnicodeScript enum #6945564. A user of java.util.regex should be able to match against these scripts as well since scripts are superior (more useful) to the old style Unicode block, in lots of use scenaris.