Go to http://japhy.perlmonk.org/patches/unicode/ and apply the patches to utf8_heavy.pl and perlunicode.pod (the first is the actual code patch, the second is merely its documentation). Then, test it. It allows you to build complex Unicode classes based on others you create (much like set theory).
If you don't understand it, don't bother. It's for a select few (and I'm not even one of the people who uses it).
In reply to Anyone use Unicode Character Classes? by japhy
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