Java正则表达式代码解析基础

正则验证

@Test
    public void verify(){
        String str = "abc_123";
        //数字字母下划线至少出现一次
        boolean rst = str.matches("\\w+");
        System.out.println(rst);
    }

结果：

正则分割

    @Test
    public void spllit(){
        String str = "adf.dasf-sdf;sdf";
        //分割标志.或-或;
        String[] split = str.split("\\.|;|-");
        for (String s : split) {
            System.out.println(s);
        }
    }

结果

正则替换

    @Test
    public void change(){
        String str = "我##爱$$...中--国";
        //去除中间的杂乱字符
        String str1 = str.replaceAll("[#$.-]", "");
        System.out.println(str1);
    }

结果：

正则分组

@Test
    public void grouping(){
        //hanset,apple;computer,huoying;pingban,apple;
        String str = "1，handset，iphone，8000；2，handset，sanxing，7000；3，handset，xiaomi，6500；";
//        String regex = "(\\d+)，([a-z])，([a-z]+(\\d+?))，(\\d)；";
        String regex = "(\\d+)，([a-z]+)，([a-z]+(\\d+)?)，(\\d+)；";
        Pattern pattern1 = Pattern.compile(regex);
        String regexCmm = "\\d+(.*?)；";
        Pattern pattern = Pattern.compile(regexCmm);
        Matcher matcher = pattern.matcher(str);
        int start = 0;
        //进行第一次分组
        while (matcher.find(start)){
            String cmm = matcher.group(0);
            Matcher matcher1 = pattern1.matcher(cmm);
            //组内继续分组
            if (matcher1.find()){
                String cmmId = matcher1.group(1);
                String cmmType = matcher1.group(2);
                String cmmName = matcher1.group(3);
                String cmmPrice = matcher1.group(5);
                System.out.println("编号: "+cmmId);
                System.out.println("类型: "+cmmType);
                System.out.println("名称: "+cmmName);
                System.out.println("价格: "+cmmPrice);

            }
            start = matcher.end();
        }
        System.out.println(matcher.matches());
    }

实现效果：