$ perl -v | grep version
This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-linux
$ /usr/bin/perl -w -E "use locale; use POSIX qw(locale_h); setlocale(LC_CTYPE,'de_DE.utf-8'); say 'betätigt' ~~ /bet\b/"
1
$ /usr/bin/perl -w -E "use POSIX qw(locale_h); setlocale(LC_CTYPE,'de_DE.utf-8'); say 'betätigt' ~~ /bet\b/"
1
$ /usr/bin/perl -w -E "say 'betätigt' ~~ /bet\b/"
1
$