Java正则表达式匹配：负面看起来不工作

Question

我有一个代码，查找正则表达式匹配，并在正则表达式匹配后添加一个新行。这可以在第一次点击按钮时起作用，但是当我再次单击它时，它仍然会捕获正则表达式。

示例场景：

变化与结尾的所有句子 '的狗。'并添加一个新行，如果它不是该行的结尾。鼠标点击事件里面

示例代码：

Pattern pattern = Pattern.compile("dog\\.(?!\n)"); 
Matcher matcher = pattern.matcher(paragraph); 
paragraph = matcher.replaceAll("dog\\.\n"); 

样品输入：

我发现了一个街头的动物。这是一只狗。然后，狗找到另一只狗。看到两只狗互相吠叫，真是有趣。

按钮，首先点击实现代码：

I found a street animal. It was a dog. 
Then the dog found another dog. 
It was kind of fun to see the two dogs barking to each other. 

按钮的第二次点击实现代码：

I found a street animal. It was a dog. 

Then the dog found another dog. 

It was kind of fun to see the two dogs barking to each other. 

我为什么在第二次点击，就没有注意到很困惑没有更多的“狗”。没有新的路线。

在此先感谢您的帮助！

Answer 1

您可以使用：

String str = 
"I found a street animal. It was a dog. \nThen the dog found another dog. \nIt was kind of fun to see the two dogs barking to each other."; 

Pattern pattern = Pattern.compile("(?<=dog\\.(?!\\s*\\n))\\s*"); 
Matcher matcher = pattern.matcher(str); 
str = matcher.replaceAll("\r\n"); 

RegEx Demo

Code Demo

Answer 2

希望下面的代码可以帮助你..

String paragraph = "I found a street animal. It was a dog. Then the dog found another dog. It was kind of fun to see the two dogs barking to each other."; 
    paragraph = paragraph.replaceAll("dog\\.(?!\n)", "dog\\.\n"); 

日Thnx。