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$query='AA Tauri';
my $url = 'https://en.wikipedia.org/w/api.php?format=json&action=query
+&prop=extracts&exintro&explaintext&redirects=1&titles=' . $query;
...
    my $decoded_json = decode_json( $json_text );
    print Dumper $decoded_json;
}

$VAR1 = {
          'query' => {
...
                     },
          'batchcomplete' => ''
        };

my $val = $decoded_json {query}{pages}{XXX}{extract};