使用正则表达式替换新行/返回空格 [英] Replace new line/return with space using regex

问题描述

对于知道某人的非常基本的问题。

Pretty basic question for someone who knows.

而不是从

"This is my text. 

And here is a new line"

收件人：

"This is my text. And here is a new line"

我得到：

"This is my text.And here is a new line.

知道为什么吗？

L.replaceAll("[\\\t|\\\n|\\\r]","\\\s");

我想我找到了罪魁祸首。

I think I found the culprit.

On下一行我做了以下几行：

On the next line I do the following:

L.replaceAll( "[^a-zA-Z0-9|^!|^?|^.|^\\s]", "");

这似乎是导致我的问题。

And this seems to be causing my issue.

知道为什么吗？

我显然在尝试执行以下操作：删除所有非字符，并删除所有新行。

I am obviously trying to do the following: remove all non-chars, and remove all new lines.

推荐答案

\ s 是正则表达式中空格字符的快捷方式。它在字符串中没有意义。 ==>您不能在替换字符串中使用它。在那里你需要准确填写你想要插入的字符。如果这是一个空格，只需使用作为替换。

\s is a shortcut for whitespace characters in regex. It has no meaning in a string. ==> You can't use it in your replacement string. There you need to put exactly the character(s) that you want to insert. If this is a space just use " " as replacement.

另一件事是：你为什么用3反斜杠作为转义序列？ Java中有两个就足够了。并且您在字符类中不需要 | （交替运算符）。

The other thing is: Why do you use 3 backslashes as escape sequence? Two are enough in Java. And you don't need a | (alternation operator) in a character class.

L.replaceAll("[\\t\\n\\r]+"," ");

备注

L 未更改。如果你想得到你需要做的结果

L is not changed. If you want to have a result you need to do

String result =     L.replaceAll("[\\t\\n\\r]+"," ");

测试代码：

String in = "This is my text.\n\nAnd here is a new line";
System.out.println(in);

String out = in.replaceAll("[\\t\\n\\r]+"," ");
System.out.println(out);

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