CODEWITHSUNDEEP
scalanewline
Luigi Plinge
Luigi Plinge

Reputation: 51109

New line character in Scala

Is there a shorthand for a new line character in Scala? In Java (on Windows) I usually just use "\n", but that doesn't seem to work in Scala - specifically

val s = """abcd
efg"""
val s2 = s.replace("\n", "")
println(s2)

outputs

abcd
efg

in Eclipse,

efgd

(sic) from the command line, and 

abcdefg

from the REPL (GREAT SUCCESS!)

String.format("%n") works, but is there anything shorter?

Upvotes: 29

Views: 65059

Answers (6)

Dmitry Ginzburg
Dmitry Ginzburg

Reputation: 7461

If you're sure the file's line separator in the one, used in this OS, you should do the following:

s.replaceAll(System.lineSeparator, "")

Elsewhere your regex should detect the following newline sequences: "\n" (Linux), "\r" (Mac), "\r\n" (Windows):

s.replaceAll("(\r\n)|\r|\n", "")

The second one is shorter and, I think, is more correct.

Upvotes: 8

skryty
skryty

Reputation: 91

Try this interesting construction :)

import scala.compat.Platform.EOL
println("aaa"+EOL+"bbb")

Upvotes: 9

Ed Staub
Ed Staub

Reputation: 15690

A platform-specific line separator is returned by

sys.props("line.separator")

This will give you either "\n" or "\r\n", depending on your platform. You can wrap that in a val as terse as you please, but of course you can't embed it in a string literal.

If you're reading text that's not following the rules for your platform, this obviously won't help.

References:

Upvotes: 32

Keith Pinson
Keith Pinson

Reputation: 1725

var s = """abcd
efg""".stripMargin.replaceAll("[\n\r]","")

Upvotes: 5

OscarRyz
OscarRyz

Reputation: 199234

Use \r\n instead

Before:

before

After:

after

Upvotes: 1

James Iry
James Iry

Reputation: 19367

Your Eclipse making the newline marker the standard Windows \r\n, so you've got "abcd\r\nefg". The regex is turning it into "abcd\refg" and Eclipse console is treaing the \r slightly differently from how the windows shell does. The REPL is just using \n as the new line marker so it works as expected.

Solution 1: change Eclipse to just use \n newlines.

Solution 2: don't use triple quoted strings when you need to control newlines, use single quotes and explicit \n characters.

Solution 3: use a more sophisticated regex to replace \r\n, \n, or \r

Upvotes: 16

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