正则表达式matcher.group用法

group是针对()来说的,group(0)指的整个串,group(1) 指的是第一个括号里的东西,group(2)指第二个括号里的东西。

@Test
    public void test01() {
        String regex = "(你*.?啊)|(AAA.*?BBB)|(CCC.*?DDD)";
        Pattern pattern = Pattern.compile(regex);
        String input = "你好啊|AAA123456内容2BcBB|CCC内容3DDD|CCC内容3DDD";

        Matcher matcher = pattern.matcher(input);
        log.info("匹配子模式数量: {}",matcher.groupCount());
        // find() 像迭代器那样向前遍历输入字符串
        while (matcher.find()) {
//            log.info("匹配项:{}",matcher.pattern().toString());
            /*group(0)就是指的整个串,group(1) 指的是第一个括号里的东西,group(2)指的第二个括*/
            log.info("👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇");
            log.info("grou0 整串-> {},start -> {} ,end -> {}",matcher.group(0),matcher.start(0),matcher.end(0));
            log.info("grou1 -> {},start -> {} ,end -> {}",matcher.group(1),matcher.start(1),matcher.end(1));
            log.info("grou2 -> {},start -> {} ,end -> {}",matcher.group(2),matcher.start(2),matcher.end(2));
            log.info("grou3 -> {},start -> {} ,end -> {}",matcher.group(3),matcher.start(3),matcher.end(3));
       }
    }

输出结果:

[21:39:24:629] [INFO] - (test001.java:19) - 匹配子模式数量: 3
[21:39:24:633] [INFO] - (test001.java:24) - 👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇
[21:39:24:633] [INFO] - (test001.java:25) - grou0 整串-> 你好啊,start -> 0 ,end -> 3
[21:39:24:633] [INFO] - (test001.java:26) - grou1 -> 你好啊,start -> 0 ,end -> 3
[21:39:24:633] [INFO] - (test001.java:27) - grou2 -> null,start -> -1 ,end -> -1
[21:39:24:634] [INFO] - (test001.java:28) - grou3 -> null,start -> -1 ,end -> -1
[21:39:24:634] [INFO] - (test001.java:24) - 👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇
[21:39:24:634] [INFO] - (test001.java:25) - grou0 整串-> CCC内容3DDD,start -> 21 ,end -> 30
[21:39:24:634] [INFO] - (test001.java:26) - grou1 -> null,start -> -1 ,end -> -1
[21:39:24:634] [INFO] - (test001.java:27) - grou2 -> null,start -> -1 ,end -> -1
[21:39:24:634] [INFO] - (test001.java:28) - grou3 -> CCC内容3DDD,start -> 21 ,end -> 30
[21:39:24:635] [INFO] - (test001.java:24) - 👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇
[21:39:24:635] [INFO] - (test001.java:25) - grou0 整串-> CCC内容3DDD,start -> 31 ,end -> 40
[21:39:24:635] [INFO] - (test001.java:26) - grou1 -> null,start -> -1 ,end -> -1
[21:39:24:635] [INFO] - (test001.java:27) - grou2 -> null,start -> -1 ,end -> -1
[21:39:24:635] [INFO] - (test001.java:28) - grou3 -> CCC内容3DDD,start -> 31 ,end -> 40

Process finished with exit code 0

可以看出,grou0 是匹配整个串,与grou() 结果相同。上面待匹配字符串中,能被 (你*.?啊)|(AAA.*?BBB)|(CCC.*?DDD) 匹配的字符串有 你好啊、CCC内容3DDD、CCC内容3DDD,所以循环了3次,对应匹配的正则是

(你*.?啊)、(CCC.*?DDD),位置刚好是对应的 grou0、grou3。

参考文章:

https://blog.csdn.net/u011289652/article/details/74474806

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