Does Perl have the equivalent of Python's multiline strings?

Normal quotes:

# Non-interpolative
my $f = 'line1
line2
line3
';

# Interpolative
my $g = "line1
line2
line3
";

Here-docs allow you to define any token as the end of a block of quoted text:

# Non-interpolative
my $h = <<'END_TXT';
line1
line2
line3
END_TXT

# Interpolative
my $h = <<"END_TXT";
line1
line2
line3
END_TXT

Regex style quote operators let you use pretty much any character as the delimiter--in the same way a regex allows you to change delimiters.

# Non-interpolative
my $i = q/line1
line2
line3
/;

# Interpolative
my $i = qq{line1
line2
line3
};

UPDATE: Corrected the here-doc tokens.

Perl doesn't have significant syntactical vertical whitespace, so you can just do

$foo = "line1
line2
line3
";

which is equivalent to

$foo = "line1\nline2\nline3\n";

Yes, a here-doc.

$heredoc = <<END;
Some multiline
text and stuff
END