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$string = 'bla bla [[en:English]][[de:German]][[ga:Irish]] bla bla';

...
pp $var;

{ lang => ["en", "ga", "de"] }

my $string = 'bla bla [[en:English]][[de:German]][[ga:Irish]] bla bla'
+;

...
pp $var;

{ lang => ["en", "de", "ga"] }