Get an array of Strings matching a pattern from a String

I have a long string let's say

I like this #computer and I want to buy it from #XXXMall.

I know the regular expression pattern is

Pattern tagMatcher = Pattern.compile("[#]+[A-Za-z0-9-_]+\\b");

Now i want to get all the hashtags in an array. How can i use this expression to get array of all hash tags from string something like

ArrayList hashtags = getArray(pattern, str)

You can write like?

private static List<String> getArray(Pattern tagMatcher, String str) {
    Matcher m = tagMatcher.matcher(str);
    List<String> l = new ArrayList<String>();
    while(m.find()) {
        String s = m.group(); //will give you "#computer"
        s = s.substring(1); // will give you just "computer"
        l.add(s);
    }
    return l;
}

Also you can use \\w- instead of A-Za-z0-9-_ making the regex [#]+[\\w]+\\b