* Michael Ludwig <michael.lud...@xing.com> [2010-04-07 15:00]: > Having read Juerd's list of useful advice, I don't understand > the reason for its last three items: > > • utf8::upgrade before doing lc/lcfirst/uc > • utf8::upgrade before doing case insensitive matching > • utf8::upgrade before matching predefined character classes > like w and s > > Can anyone enlighten me on the background of using > utf8::upgrade here?
Perl versions up to the upcoming 5.12.0 (I think) are buggy in that they apply ISO-8859-1 semantics to downgraded strings and Unicode semantics to upgraded strings, even when they contain the same data. By upgrading your strings, you make sure that you get Unicode semantics consistently. Regards, -- Aristotle Pagaltzis // <http://plasmasturm.org/>
