• C

char *s = "Huey\n"
          "Dewey\n"
          "Louie";

• Clojure

(def s "Murs, ville,
Et port,
Asile
De mort,
Mer grise
Où brise
La brise,
Tout dort.")

• C++

std::string multiline = R"( Earth is a planet.
So is the Jupiter)";

• C#

string s = @"Huey
Dewey
Louie";

• D

auto str = "One,
Two,
Three
";

• D

auto s = ` line1
line2
line3`;

auto r = r" line1
line2
line3`;

• Dart

var s = '''A
multi-line
string''';

• Elixir

s = "Spanning
string
works"

• Elixir

s = """
multiline
heredoc
"""

• Erlang

S = "Strings
may span
across multiple lines"
"and they can"
"have as many portions"
"as you want"
"all of them quoted".

• Go

s := `Huey
Dewey
Louie`

• Haskell

s = unlines [
     "several"
    ,"lines"
    ,"of"
    ,"text"]

• JS

let s = "This is a very long string which needs \
to wrap across multiple lines because \
otherwise my code is unreadable.";

• JS

let s = `This is a very long string which needs 
to wrap across multiple lines because 
otherwise my code is unreadable.`;

• JS

let s = "This is a very long string which needs " +
        "to wrap across multiple lines because " +
        "otherwise my code is unreadable.";

• Java

String s = "This is a very long string which needs " +
           "to wrap across multiple lines because " +
           "otherwise my code is unreadable.";

• Lua

s = [[
Huey
Dewey
Louie
]]

• Lua

str = 'Huey '..
'Dewey '..
'Louie'

• PHP

$s = "This string 
is spanning
three lines";

• PHP

$s = <<<EOD
Huey
Dewey
Louie
EOD;

• Pascal

var 
  _s: String;
begin
  _s := 'one' + LineEnding + 'two' + LineEnding + 'three'
end.

• Perl

$s = "Perl normally allows
strings to contain newlines.";
$s = q{
There are a good few ways to create multiline
text strings in perl.
};
$s =<<EOSTR;
One of them is called the "here doc" (lifted from various UNIX shells).
A 'here doc' is the <<tag construct.  Perl continues to treat
all the text found as part of the string until there's a line containing
the EOSTR tag at the beginning
EOSTR

• Python

s = """Huey
Dewey
Louie"""

• Ruby

s = "Spanning
string
works"

• Rust

let s = r#"Huey
Dewey
Louie"#;

• Rust

let s = "line 1
line 2
line 3";

• Scala

val s = """line 1
line 2
line 3"""