assertTrue(StringUtil.startsWithIgnoreCase("isHoge", "is"));
        assertTrue(StringUtil.startsWithIgnoreCase("isHoge", "IS"));
        assertTrue(StringUtil.startsWithIgnoreCase("ISHoge", "is"));
        assertFalse(StringUtil.startsWithIgnoreCase("isHoge", "iss"));
        assertFalse(StringUtil.startsWithIgnoreCase("is", "iss"));
    }

    /**
     * @throws Exception
     */

     * @param target2
     *            the substring to compare
     * @return {@literal true} if the string starts with the specified substring, ignoring case
     */
    public static boolean startsWithIgnoreCase(final String target1, final String target2) {
        if (target1 == null || target2 == null) {
            return false;
        }
        final int length1 = target1.length();