remove polldaddy from content

remove-poll-daddy.php

/**
 * Removing the poll from the main content since
 * we push it in to the sidebar
 *
 * @since 1.0
 */
function sfn_remove_poll_daddy( $content = null ){
	global $post;

	$content = $post->post_content;

	if( is_single() && is_main_query() && get_post_type() == 'post' ){
		$pattern = get_shortcode_regex();
		preg_match('/'.$pattern.'/s', $content, $matches);
		if ( isset($matches[2]) && is_array($matches) && $matches[2] == 'polldaddy') {
			//shortcode is being used
			$content = str_replace( $matches['0'], ' ', $content );
		}
	}
	return $content;
}
add_filter( 'the_content', 'sfn_remove_poll_daddy' );