runtime/src/main/java/org/echocat/jomon/runtime/StringUtils.java
@Nonnegative
    public static int countSubString(@Nonnull String string, @Nonnull String sub) {
        int count = 0;
        int pos = 0;
        do {
            pos = string.indexOf(sub, pos);
            if (pos != -1) {
                count++;
                pos += sub.length();
            }
        } while (pos != -1);
        return count;
    }
@Nonnegative
    public static int countSubString(@Nonnull String string, @Nonnull String sub) {
        int count = 0;
        int pos = 0;
        do {
            pos = string.indexOf(sub, pos);
            if (pos != -1) {
                count++;
                pos += sub.length();
            }
        } while (pos != -1);
        return count;
    }
Count the number of occurrences of sub in s