Question

我有一个代码，用于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。这可以在第一次单击按钮时起作用，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：

更改以'dog。结尾的所有句子。如果它不是该行的末尾，则添加一个新行。

鼠标点击事件中的示例代码：

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

示例输入：

我发现了一只街头动物。这是一只狗。然后狗发现了另一只狗。看到两只狗互相吠叫真是太有趣了。

首先单击实现代码的按钮：

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.

再次单击实现代码的按钮：

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.

我很困惑为什么在第二次点击时，它没有注意到没有更多的'狗'实例。没有换行。

提前感谢您的帮助！

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。

Java Regex Matcher：否定的外观不起作用

2 个答案: