how to remove \r and \n from my string in java?

Question

I'm just trying to remove (replace with "") \r and \n from my JSON. Here is the method I'm currently testing which doesn't work.

    public static void testing(){
        String string = "\r\r\r\n\n\n";
        string.replace("\r", "");
        string.replace("\n", "");
    }

`String.replace` returns the modified string. You need `string = string.replace(...)` — khelwood, Oct 08 '15 at 07:15
Possible duplicate of [Hints for java.lang.String.replace problem?](http://stackoverflow.com/questions/1166905/hints-for-java-lang-string-replace-problem) — Nitek, Oct 08 '15 at 07:16
The awkward moment is that it works with normal strings but not working with jsonString. The testing method is fixed by you suggested, @khelwood. — Zin Win Htet, Oct 08 '15 at 07:27
One should never manipulate JSON strings directly. Use a proper JSON library instead. — Eric Aya, Aug 30 '21 at 11:54

score 3 · Answer 1 · answered Oct 08 '15 at 07:20

3

Try this regex (\\r\\n|\\n|\\r) and String#replaceAll, like:

string = string.replaceAll("(\\r\\n|\\n|\\r)", "");

answered Oct 08 '15 at 07:20

Stanislav

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This is juz my mistake. I'll post another question. My testing method works after assigning back but actual method I'm working doesn't work. – Zin Win Htet Oct 08 '15 at 07:35

score 2 · Answer 2 · answered Oct 08 '15 at 07:30

2

After replacing you need to assign back to the original string. Because the string is immutable you cannot change the value of a string. You need to use

String string = "\r\r\r\n\n\n";
string  = string.replace("\r", "");
string  = string.replace("\n", "");

Or you can use any libraries like Apache StringUtils.If you are using these utils , no needs to assign back the value to String

answered Oct 08 '15 at 07:30

dileep H

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This is juz my mistake. I'll post another question. My testing method works after assigning back but actual method I'm working doesn't work. – Zin Win Htet Oct 08 '15 at 07:35

score 1 · Answer 3 · answered Oct 08 '15 at 07:20

1

try this:

public static void testing(){
    String string = "\r\r\r\n\n\n";
    string  = string.replace("\r", "");
    string  = string.replace("\n", "");
}

because replace return another string(new String) because String is immutable so unable to modified directly

answered Oct 08 '15 at 07:20

Pankaj Saboo

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This is juz my mistake. I'll post another question. My testing method works after assigning back but actual method I'm working doesn't work. – Zin Win Htet Oct 08 '15 at 07:35
Including yours, every answer is correct. But that's not what I need. – Zin Win Htet Oct 08 '15 at 09:05
please edit your question and explain what you want to as exactly – Pankaj Saboo Oct 08 '15 at 09:07
do u want to replace \r and \n from json object??? if yes then do u want it from serverside or clientside??? – Pankaj Saboo Oct 08 '15 at 09:14
Yap, I was about to post it as new post. But I already found the answer. It might be duplicated if I post it. – Zin Win Htet Oct 08 '15 at 09:17
thz dude, here is what I found. data_json = data_json.replaceAll("\\\\r\\\\n", ""); – Zin Win Htet Oct 08 '15 at 09:20

score 1 · Answer 4 · answered Oct 08 '15 at 07:23

1

String.replace will return a string. It doesn't change its value.

public static void testing(){
    String str = "\r\r\r\n\n\n";
    str = str.replace("\r", "");
    str = str.replace("\n", "");
}

answered Oct 08 '15 at 07:23

j4rey

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This is juz my mistake. I'll post another question. My testing method works after assigning back but actual method I'm working doesn't work. – Zin Win Htet Oct 08 '15 at 07:35

score 1 · Answer 5 · answered Oct 08 '15 at 09:10

1

    String string = "\r\r\r\n\n\n";
    String newStr = string.replace("\r", "");
    newStr = newStr.replace("\n", "");
    System.out.println(newStr);

String will return new String Object.

answered Oct 08 '15 at 09:10

Stan

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score 0 · Answer 6 · answered Oct 08 '15 at 09:24

0

try this:

    String string = "\rte\r\rs\nti\nn\ng";
    String newString = string.replaceAll("[^\\w]", "");

answered Oct 08 '15 at 09:24

Chathura

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the answer is , data_json = data_json.replaceAll("\\\\r\\\\n", ""); – Zin Win Htet Oct 08 '15 at 09:59

score 0 · Answer 7 · answered Mar 15 '19 at 04:03

0

String string = "\r\r\r\n\n\n";
string = string.replaceAll("\r", "");
string = string.replaceAll("\n", "");

answered Mar 15 '19 at 04:03

Stan

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score 0 · Answer 8 · answered Aug 30 '21 at 10:19

0

Try this, string = string.replaceAll("[\r\n]", "");

answered Aug 30 '21 at 10:19

user16786427

1

Please add further details to expand on your answer, such as working code or documentation citations. – Community Aug 30 '21 at 11:45

score 0 · Answer 9 · answered Aug 30 '21 at 11:53

0

Here is what I found:

data_json = data_json.replaceAll("\\\\r\\\\n", "");

Copied from OP's comment.

answered Aug 30 '21 at 11:53

Eric Aya

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how to remove \r and \n from my string in java?

9 Answers9