public static String get(String regex, CharSequence content, int groupIndex) {
		if (null == content || null == regex) {
			return null;
		}

		final Pattern pattern = PatternPool.get(regex, Pattern.DOTALL);
		return get(pattern, content, groupIndex);
	}
@Test
	public void getByGroupNameTest() {
		final String content = "2021-10-11";
		final String regex = "(?<year>\\d+)-(?<month>\\d+)-(?<day>\\d+)";
		final String year = ReUtil.get(regex, content, "year");
		assertEquals("2021", year);
		final String month = ReUtil.get(regex, content, "month");
		assertEquals("10", month);
		final String day = ReUtil.get(regex, content, "day");
		assertEquals("11", day);
	}