This week in The Effective Perler, I posted about the oddness of character classes. In Know your character classes under different semantics”, I showed that the trusty character class shortcuts \w, \w, and \s that we know from the first edition aren’t the same thing now. In fact, they haven’t been the same thing since the fourth edition. As I’ve said before, we have basically ignored Unicode despite its support since Perl 5.6. Now we’re paying the Unicode tax; I just have to integrate this into the Learning Perl.