正则表达式适用于在线测试程序但在java中失败

I have the following regular expression (link)

我有以下正则表达式（链接）

[\d\.]+[ ](.*?)[ ]{2,}(.+)

However the equivalent Java code, fails to match:

但是，等效的Java代码无法匹配：

String REGEX = "[\\d\\.]+[ ](.*?)[ ]{2,}(.+)";
Pattern pattern = Pattern.compile(REGEX);
String line = "1. QUEEN                   WE ARE THE CHAMPIONS"
Matcher matcher= pattern.matcher(line);
String artist = matcher.group(0);
String song = matcher.group(1);

I can't seem to understand what goes wrong, any ideas?

我似乎无法理解出了什么问题，任何想法？

2 个解决方案

#1

You need to call find to move to the first match. Add matcher.find(); before calling group().

你需要调用find来移动到第一场比赛。添加matcher.find（）;在调用group（）之前。

Once you do that your code works as expected.

完成后，您的代码将按预期工作。

#2

You need to call matcher.matches() before group.

你需要在group之前调用matcher.matches（）。

if(matcher.matches()){
        String artist = matcher.group(0);
        System.out.println(artist);
        String song = matcher.group(1);
        System.out.println(song);
        }

#1