Find URL in post

gistfile1.aw

<?php
//** Website: http://links.billerickson.net/ 

//** In functions.php: **//

// Find URL in post
function be_find_url( $content ) {
	preg_match( '|href=["]([^\'^"]+)["]|mi', $content, $m ); 
	return $m[1];
}


//** In the loop (for testing) **//
$content = get_the_content(); 
echo 'URL: ' . be_find_url( $content );

//** Final goal, update RSS permalink to point to link and not single URL **//

// Change RSS permalink to url
add_filter( 'the_permalink_rss', 'be_rss_permalink' );
function be_rss_permalink( $permalink ) {
	$url = be_find_url( $wp_query->$post->post_content );
	if( !empty( $url ) ) return $url; 
	else return $permalink;
}