word counting

    private static final String REGEX_NOT = "^";
    private static final String REGEX_WORD_EXPECTED = "[%s]+";
    private static final String REGEX_LOWERCASE = "a-z";
    private static final String REGEX_UPPERCASE = "A-Z";
    private static final String REGEX_NUMERIC = "0-9";
    private static final String REGEX_WHITESPACE = "\\s+";
    private static final String REGEX_ENGLISH = "[a-zA-Z]+";
    private static final String REGEX_CHINESE = "\u2E80-\u2FD5\u3190-\u319f\u3400-\u4DBF\u4E00-\u9FCC";


    public static int getWordCounts(String from) {
        int zhCount = getSplitedZhWords(from).length;
        int enCount = getSplitedEnWords(from).length;
        Timber.d("zhCount %d | enCount %d", zhCount, enCount);
        return zhCount + enCount;
    }

    public static String getZhWords(String from) {
        return from
                .replaceAll(String.format(REGEX_WORD_EXPECTED, REGEX_NOT + REGEX_CHINESE), "")
                .replaceAll("", " ")
                .replaceAll(REGEX_WHITESPACE, " ")
                .trim();
    }

    public static String getEnWords(String from) {
        return from
                .replaceAll(String.format(REGEX_WORD_EXPECTED, REGEX_NOT + REGEX_NUMERIC + REGEX_LOWERCASE + REGEX_UPPERCASE), " ")
                .replaceAll(String.format(REGEX_WORD_EXPECTED, REGEX_NOT + REGEX_ENGLISH), " ")
                .replaceAll(REGEX_WHITESPACE, " ")
                .trim();
    }

    public static String[] getSplitedZhWords(String from) {
        final String zhWords = getZhWords(from);
        Timber.d("zhWords \n%s\n", zhWords);
        return (TextUtils.isEmpty(zhWords)) ? new String[0] : zhWords.split(REGEX_WHITESPACE);
    }

    public static String[] getSplitedEnWords(String from) {
        final String enWords = getEnWords(from);
        Timber.d("enWords \n%s\n", enWords);
        return (TextUtils.isEmpty(enWords)) ? new String[0] : enWords.split(REGEX_WHITESPACE);
    }


    public static int getWordCounts(String find, String from) {
        return getWordCounts(false, find, from);
    }

    public static int getWordCounts(boolean ignoreCase, String find, String from) {
        if (ignoreCase) find = find.toLowerCase(Locale.ENGLISH);
        if (ignoreCase) from = from.toLowerCase(Locale.ENGLISH);
        final ArrayList<String> fromList = new ArrayList<>();
        fromList.addAll(Arrays.asList(getSplitedZhWords(from)));
        fromList.addAll(Arrays.asList(getSplitedEnWords(from)));
        return Collections.frequency(fromList, find);
    }