How to split string with empty new line

Question

my file contains this string:

a

b

c

now I want to read it and split it with empty line so I have this:

text.split("\n\n"); where text is output of file

problem is that this doesnt work. When I convert new line to byte I see that "\\n\\n" is represented as 10 10 but new line in my file is represented by 10 13 10 13. So how I can split my file ?

Answer 1

Escape  Description            ASCII-Value
\n      New Line Feed (LF)     10
\r      Carriage Return (CR)   13

So you need to try string.split("\\n\\r") in your case.

Edit

If you want to split by empty line , try \\n\\r\\n\\r . Or you can use .readLine() to read your file, and skip all empty lines.

Are you sure it's 10 13 10 13 ? It always should be 13 10 ...

And, you should not depend on line.separator too much. Because if you are processing some files from *nix platform, it's \\n , vice versa. And even on Windows, some editors use \\n as the new line character. So I suggest you to use some high level methods or use string.replaceAll("\\r\\n", "\\n") to normalize your input.

Answer 2

尝试使用：

text.split("\n\r");

Answer 3

Keep in mind, sometimes you have to use:

System.getProperty("line.separator");

to get the line separator, if you want to make it platform independent. You can also use BufferedWriter's newLine() method, that takes care of that automatically.

Answer 4

Why are you splitting on \\n\\n ?

You should be splitting on \\r\\n because that's what the file lines are separated by.

Answer 5

One Solution is to Split using "\\n" and neglect empty Strings

List<String> lines = text.split("\n");

for(String line : lines) {
  line = line.trim();
  if(line != "") {
      System.out.println(line);
  }
}

Answer 6

尝试使用正则表达式，例如：

 
 
 
 
  
  
  text.split("\\\\W+");
 
 
  

text.split("\\s+");

Answer 7

LF: Line Feed, U+000A
CR: Carriage Return, U+000D

so you need to try to use  
"string".split("\r\n");

Answer 8

使用扫描仪对象，而不用担心字符/字节。