Get the first link of a post ?

I'm currently trying to get the first link of a post for a specific post format, but preg_match needs two parameters and I can't find the second... Here is my code :

(...)

} else if (($post['Post']['format']) == 'link') {

if (preg_match('/<a\s[^>]*?href=[\'"](.+?)[\'"]/is')a) {

return $firstLink;

} else {

return $articleLink;

}

(...)

How can I make this work in my view ? Thanks a lot.

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