preg_replace insert newline

[Sam Smith <ss@xxxxxxxxxx>]

$string = 'text with no newline';
$pattern = '/(.*)/';
$replacement = '${1}XX\nNext line';
$string = preg_replace($pattern, $replacement, $string);
echo $string;

Outputs:
text with no newlineXX\nNext line
Instead of:
text with no newlineXX
Next line

How does one insert a newline with preg_replace?

Thanks

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