Method isUnsignedInteger

MathParser/src/com/aghajari/math/Utils.java:192–199

(String s)

    }

    public static boolean isUnsignedInteger(String s) {
        if (s.isEmpty()) return false;
        for (int i = 0; i < s.length(); i++) {
            if (!Character.isDigit(s.charAt(i)))
                return false;
        }
        return true;
    }

    public static String realTrim(String src) {
        return src.trim().replaceAll("\\s+", "");