Removes the closing bracket at the end of WordPress' oEmbed using YouTube.

functions.php

<?php

function remove_youtube_parenthesis ($html, $url ) {
    if ( preg_match('#https?://(www\.)?youtu#i', $url) ) {
        $html = preg_replace('/\)$/', '', $html);
    }

    return $html;
}

add_filter( 'oembed_result',     'remove_youtube_parenthesis ', 10, 2 );
add_filter( 'embed_oembed_html', 'remove_youtube_parenthesis ', 10, 2 );

Howdy! I tried to post an edit to your answer on Stackoverflow to include filtering already cached YouTube embeds, but it was rejected (unsure why). Anyway, I don't have enough points to post my own answer so I figured I'd just tell you and let you update the answer if you want to. Here is my gist: https://gist.github.com/tannerm/9534016.

-Tanner

yea updated it! thanks