模式匹配器按字母顺序排列

Question

我使用java class Pattern过滤搜索query。我希望返回的项目是字母数字顺序 - 即A-Z0-9，不区分大小写。我如何在下面的代码中实现它？是的它是Android，但它都是Java :)过滤器有效，我只需按顺序放置pattern结果！提前谢谢。

这里定义了过滤器：

@Override
public android.widget.Filter getFilter() {
    return new Filter(
            new AnonListAdapter.Predicate<InstanceAnonChartData, CharSequence>() {
                public boolean test(InstanceAnonChartData instance,
                        CharSequence constraint) {
                    if (constraint != null) {
                        String query = constraint.toString();
                        if (query.isEmpty())
                            return true;

                        // Matches any word starting with the given string
                        Pattern pattern = Pattern.compile("(?i-m)(^|\\W)" + query);

                        // Check if the pattern matches either the symbol or the name
                        return pattern.matcher(instance.getName()).find() ||
                                pattern.matcher(instance.getSymbol()).find();
                    }
                    return true;
                }
            });
}

这里实现了过滤器：

public void applyFilter(CharSequence query) {
    if (_listAdapter != null && query != null) {
        Filter listFilter = _listAdapter.getFilter();
        if (listFilter != null) {
            listFilter.filter(query);
        }
    }
}
...
private void handleIntent(@NonNull Intent intent) {
    // Handle "Search" intents
    if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
        // SearchManager.QUERY is the key that a SearchManager will use to send a query string
        // to an Activity.
        String query = intent.getStringExtra(SearchManager.QUERY);
        _listFragment.applyFilter(query);
    }
}