CODEWITHSUNDEEP
javastring
阳光Emi
阳光Emi

Reputation: 143

how to use regex or other ways to remove extra '\r\n' in java string

I have a String like this:

String orginal = "this is for test hello\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n" +
    "\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nhello" + 
    "\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nhello";

The user press 'enter' a lot of time when input content in text area, so in java, it change to a lot of '\r\n'. I want to change it to:

String newStr = "this is for test hello\r\nhello\r\nhello"

How can I keep only one \r\n

Upvotes: 1

Views: 517

Answers (2)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 136002

Generic solution (LF - UNIX, CR- Mac, CRLF - Windows) could be like this

String newStr = original.replaceAll("(\r\n|\r|\n)+", "$1");

Upvotes: 0

Zutty
Zutty

Reputation: 5377

This ought to do it...

String newStr = original.replaceAll("(\r\n)+", "\r\n");

You might also want to consider using the line.separator system property instead of hard coding \r\n, since this may be different on other platforms. For instance Unix just uses a single line feed \n. This would be more portable...

final String NEWLINE = System.getProperty("line.separator");
String newStr = original.replaceAll("(" + NEWLINE + ")+", NEWLINE);

Upvotes: 5

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