From perllocale:

By default, Perl ignores the current locale. The "use locale" pragma tells Perl to use the current locale for some operations: [ ... ] lc().
$ perl -le 'print lc "ÄÖÜ";'
ÄÖÜ

$ echo $LC_ALL
de_DE

$ perl -Mlocale -le 'print lc "ÄÖÜ";'
äöü

[download]

You can switch the current locale in your perl program reading locale or perllocale.

And BTW: lc is the same as "\L".

-- Frank

In reply to Re: Lowercasing umlauts in words by haoess
in thread Lowercasing umlauts in words by Anonymous Monk

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