主要两个类 Pattern Matcher

• java.util.regex.Pattern
• java.util.regex.Matcher

简单用法示例

	String str1 = "=##0086QN=202108061659017;ST=32;CN=9014;MN=WWSZ0003120020;CP=&&QN=20210806170000000;CN=2011&&F881\r\n"
			;
	
	@Test void test0000100000() {
		Pattern pattern = Pattern.compile("&&.*&&");
		Matcher matcher = pattern.matcher(str1);
		matcher.find();  //find()返回boolean,可判断是否包含
		String s2 = matcher.group();  //必须find()后才能group()
		System.out.println(s2);
	}