Perl Unicode Cookbook: Case- and Accent-insensitive Locale Comparisons

℞ 40: Case- and accent-insensitive locale comparisons

You now know how to compare Unicode strings while ignoring case and accent differences. This approach uses the standard Unicode collation algorithm. To perform a similar comparison while respecting a specific locale's rules, use Unicode::Collate::Locale:

 my $de = Unicode::Collate::Locale->new(
            locale => "de__phonebook",
          );

 # now this is true:
 $de->eq("tschüß", "TSCHUESS");  # notice ü => UE, ß => SS

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