String regExp = "YOUR_REGEXP_HERE";
Pattern mPattern = Pattern.compile(regExp)

public List<String> getGroupsFromString(String input, String pattern) {
    Pattern mPattern = Pattern.compile(pattern);
    Matcher mMatcher = mPattern.matcher(input);
    List<String> toReturn = new LinkedList<>();

    while(mMatcher.find()) {
        toReturn.add(mMatcher.group());
    }

    return toReturn;
}