在java中用<br />替换\n和\r\n
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replace \n and \r\n with <br /> in java
提问by Bala R
This has been asked several times for several languages but I can't get it to work. I have a string like this
对于多种语言已多次询问此问题，但我无法使其正常工作。我有一个这样的字符串
String str = "This is a string.\nThis is a long string.";
And I'm trying to replace the \nwith <br />using
我试图\n用<br />使用来替换
str = str.replaceAll("(\r\n|\n)", "<br />");
but the \nis not getting replaced.
I tried to use this RegEx Toolto verify and I see the same result. The input string does not have a match for "(\r\n|\n)". What am i doing wrong ?
但\n没有被取代。我尝试使用此RegEx 工具进行验证，但看到了相同的结果。输入字符串不匹配"(\r\n|\n)"。我究竟做错了什么 ？
采纳答案by Mark Byers
It works for me.
这个对我有用。
public class Program
{
public static void main(String[] args) {
String str = "This is a string.\nThis is a long string.";
str = str.replaceAll("(\r\n|\n)", "<br />");
System.out.println(str);
}
}
Result:
结果：
This is a string.<br />This is a long string.
Your problem is somewhere else.
你的问题在别处。
回答by Byron Whitlock
That should work, but don't kill yourself trying to figure it out. Just use 2 passes.
这应该可行，但不要试图弄明白这一点而自杀。只需使用 2 次通行证。
str = str.replaceAll("(\r\n)", "<br />");
str = str.replaceAll("(\n)", "<br />");
Disclaimer: this is not very efficient.
免责声明：这不是很有效。
回答by Kasturi
This should work. You need to put in two slashes
这应该有效。你需要输入两个斜线
str = str.replaceAll("(\r\n|\n)", "<br />");
In this Reference, there is an example which shows
在此参考中，有一个示例显示
private final String REGEX = "\d"; // a single digit
I have used two slashes in many of my projects and it seems to work fine!
我在我的许多项目中使用了两个斜线，它似乎工作正常！
回答by Dolph
A little more robust version of what you're attempting:
您正在尝试的更强大的版本：
str = str.replaceAll("(\r\n|\n\r|\r|\n)", "<br />");
回答by Alan Moore
It works for me. The Java code works exactly as you wrote it. In the tester, the input string should be:
这个对我有用。Java 代码完全按照您编写的方式工作。在测试器中，输入字符串应该是：
This is a string.
This is a long string.
...with a real linefeed. You can't use:
...真正的换行。你不能使用：
This is a string.\nThis is a long string.
...because it treats \nas the literal sequence backslash 'n'.
...因为它被视为\n文字序列反斜杠 'n'。
回答by Nino van Hooff
For me, this worked:
对我来说，这有效：
rawText.replaceAll("(\\r\\n|\\n)", "\\n");
Tip: use regex testerfor quick testing without compiling in your environment
提示：使用regex tester进行快速测试，无需在您的环境中编译
回答by user3798668
Since my account is new I can't up-vote Nino van Hooff's answer. If your strings are coming from a Windows based source such as an aspx based server, this solution does work:
由于我的帐户是新帐户，因此我无法对 Nino van Hooff 的回答进行投票。如果您的字符串来自基于 Windows 的源，例如基于 aspx 的服务器，则此解决方案确实有效：
rawText.replaceAll("(\\r\\n|\\n)", "<br />");
Seems to be a weird character set issue as the double back-slashes are being interpreted as single slash escape characters. Hence the need for the quadruple slashes above.
似乎是一个奇怪的字符集问题，因为双反斜杠被解释为单斜杠转义字符。因此需要上面的四重斜线。
Again, under most circumstances "(\\r\\n|\\n)"should work, but if your strings are coming from a Windows based source try the above.
同样，在大多数情况下"(\\r\\n|\\n)"应该可以工作，但如果您的字符串来自基于 Windows 的源，请尝试上述操作。
Just an FYI tried everything to correct the issue I was having replacing those line endings. Thought at first was failed conversion from Windows-1252to UTF-8. But that didn't working either. This solution is what finally did the trick. :)
仅供参考，我尝试了一切来纠正我替换这些行尾的问题。起初以为是从Windows-1252to转换失败UTF-8。但这也不起作用。这个解决方案最终成功了。:)
