Sorting using the Unicode Collation Algorithm (UCA) is available in the core module Unicode::Collate bundled with Perl 5.8 or on CPAN. Sorting using the UCA with linguistic tailoring is available in ...

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but it doesn't really handle Unicode at all," Kernighan tells interviewer professor David Brailsford. "A few months ago, I spent some time working with (laughs) an incredibly old program.