[ruslan_mart]

var str = 'basaokna@saturn;suzuki2.sales@saturn;afanasyev.andrey@saturn;79028380801;79197076971;89199176972;';

var result = str.split(';').filter(function(item) {
    return item.indexOf('@') + 1;
});

alert(result);

var str = 'basaokna@saturn;suzuki2.sales@saturn;afanasyev.andrey@saturn;79028380801;79197076971;89199176972;';

var result = str.match(/[^;]+?@[^;]+/g);

alert(result);