java 中使用正则

var str = "a222b333c";
var matcher = Pattern.compile("\\d+").matcher(str);
while(matcher.find()) {
    //输出匹配到数据
    System.out.println(matcher.group());
    //拿到所有匹配项都被替换过的str
    var replacedStr = matcher.replaceAll("数字");
    //拿到首个匹配项被替换过的str
    var firstReplacedStr = matcher.replaceFirst("数字");
}

//拿到被正规匹配到数据分隔的字符串
var items = Pattern.compile("\\d+").split("a1b2c3d45ef");