Java replaceAll with new lines in regex

Question

I want to replace text "1\n2" ("1" new line and "2")with for example "abcd". I've been searching a lot for solution but I can't find.

Below is my code

String REGEX = "1\n2";
Pattern p = Pattern.compile(REGEX, Pattern.DOTALL);
Matcher m = p.matcher(text);
String newText = m.replaceAll("abcd");

[EDIT] I'd like to add that text variable is read from file:

String text = new Scanner(new File("...")).useDelimiter("\\A").next();

Not working. When it's tabulator "1\t2" or "1\\t2" it works. — mydew
– mydew, Commented Sep 30, 2013 at 12:45
@user1411881 can you please paste the string which you are trying to modify ?? — Suresh Atta
– Suresh Atta, Commented Sep 30, 2013 at 13:02

Suresh Atta · Accepted Answer · 2013-09-30 13:00:26Z

4

Try to change your regex to

String REGEX = "1\\n2";

So it escapes the \n

Example:

public static void main(String[] args) {
    String REGEX = "1\n2";
    Pattern p = Pattern.compile(REGEX, Pattern.DOTALL);
    Matcher m = p.matcher("test1\n2test");
    String newText = m.replaceAll("abcd");
    System.out.println(newText);
}

O/P:

testabcdtest

Or even simply

String newText = "test1\n2test".replaceAll("1\n2", "abcd");

O/P

testabcdtest

edited Sep 30, 2013 at 13:00

answered Sep 30, 2013 at 12:39

Suresh Atta

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Comments

JB Nizet · Accepted Answer · 2013-09-30 12:40:49Z

1

Why use a regex for this? Just use

String newText = text.replace("1\n2", "abcd");

answered Sep 30, 2013 at 12:40

JB Nizet

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1 Comment

JB Nizet Over a year ago

Then your text doesn't contain "1\n2". Maybe it contains "1\r\n2"?

Rijo Joseph · Accepted Answer · 2013-09-30 12:44:45Z

0

try this

String str="Your String"
str=str.replace("1\n2","abc");

answered Sep 30, 2013 at 12:44

Rijo Joseph

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