使用正则表达式在java中分隔字符串的数组

Question

我有一个String str="[12] word1 word2 (12.4%)"

我需要的是只获取word1 word2并用下划线替换空格，输出应该是这样的word1_word2

在那之后，我如何使它动态地，比如str may，单词可能会像word1_word2_word3_etc一样递增

如何使代码尽可能短

Answer 1

可以使用split（）拆分单词。然后使用字符串生成器将它们组合在一起

总体思路如下（可能不是100%正确）：

String[] words = str.split(" ");
StringBuilder sb = new StringBuilder();

// So don't include the first and last word as they are "[12]" and "(12.4%)".
// It doesn't matter how many words you have as we use words.length
for (int i = 1; i < words.length - 1; ++i) 
{
    // you could figure out a better method to add "_"
    if (i != 1)
    {
        sb.append("_");
    }
    sb.append(words[i]);
}
String result = sb.toString();