It depends also on your locale setting, even if you do not use UTF-8. Try this:

perl -e'print ((sort grep /\w/, map { chr } 0..255), $/)'
__END__
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
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The output for de depends if your system use utf8 or iso8859-15 for de.

export LC_ALL=de_DE@euro
perl -e 'use locale; print ((sort grep /\w/, map { chr }0..255), $/);'
__END__
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz??ª?µ?º
+???ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ
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