Capturing newline with regexp at end of css selector?

I am trying to capture the newline at the end of a CSS file selector so that I can insert a new CSS property but am having a real tough time doing so...

Let's say I have this...

body {
   width: 100px;
   height: 100px;
}

Code (markup):

And I want it to end up like this...

body {
   background: url("some-image.png") repeat-x;
   width: 100px;
   height: 100px;
}

Code (markup):

Here is what I have so far...

$text = preg_replace('/
   (body\s+{\n?)
   (.*?})
   /sx', '$1   background: url("some-image.png") repeat-x;$2', $text);

Code (markup):

$text is a variable into which I have read the CSS file as it exists before the change desired.

The 3 spaces before each property inside the body selector can either be spaces or tabs.

How do I capture the ending newline in the first capture such that $1 will insert everything in the first capture (including the newline) back into the replacement string?

Anybody got any suggestions?

Carlos

 

\r\n maybe? It could be combo (which is chr 10 + 13)

 

Thanks ccoonan.

I finally figured it out though I am not sure I fully understand why it works.

$text = preg_replace('/
(
body
\s*    # match 0 or more spaces
{
.*     # match 0 or more characters including newlines as a result of the s modifier
)
}
/Usx', '$1'."\n   background: url(".parent::$pageBackground.") repeat-x;\n   }", $text);

Code (markup):

Carlos