Java，在$符号之间提取单词 [英] Java, extracting words between $ symbol

问题描述

我想使用Java提取美元符号$之间的单词.

Using Java, I want to extract the words between the dollarsign symbol $.

例如:

String = " this is first attribute $color$. this is the second attribute $size$"

我想拉出字符串:color和size并将它们放入列表中.

I want to pull out the strings: color and size and put them into a List.

我尝试过:

Pattern pattern = Pattern.compile("(\\$) .* (\\$)");
Matcher matcher = pattern.matcher(sentence);

但是我得到了输出:

"$color$.this is the second attribute $size$"

做到这一点的最佳方法是什么?

What is the best way to do this?

推荐答案

问题是您使用的正则表达式贪婪，并且消耗了字符串中从第一个$到最后一个$的所有内容.您必须在*之后添加一个?，以使正则表达式变得非贪婪:

The problem is that the regex you are using is greedy and consumes everything beginning at the first $ until the last $ in your string. You have to add a ? after the * to make the regex nongreedy:

Pattern pattern = Pattern.compile("\\$(.*?)\\$");
Matcher matcher = pattern.matcher(sentence);
List<String> result = new ArrayList<String>();
for(int i=1; i <= matcher.groupCount(); i++)
    result.add(matcher.group(i);

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