$youtubeVal=http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage
	
var regExp = /^.*(youtu.be/|v/|u/w/|embed)([^#&?]*).*/;
var match = url.match(regExp);
if (match&&match[2].length==11){
    return match[2];
}
	
youtubeVal.substring(29, 39);
	
function GetYoutubeID($url) {
    $temp = parse_url($url);

    if(isset($temp['query'])) {
        parse_str($temp['query'], $temp2);
        if(isset($temp2['v'])) {
            return $temp2['v'];
        }
    }

    if(isset($temp['path'])) {
        $temp2 = explode("/", $temp['path']);
        foreach($temp2 as $value) {
            if(strlen($value) == 11 || strlen($value) == 10) {
                return $value;
            }
        }
    }

    return "no ID?";
}

echo $youtubeID = GetYoutubeID('http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage') . "n";
echo $youtubeID = GetYoutubeID('https://www.youtube.com/embed/6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('https://youtube.com/embed/6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('http://www.youtube.com/watch?v=6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('http://www.youtube.com/watch?v=6FjfewWAGdE&feature=player_detailpage') . "n";
echo $youtubeID = GetYoutubeID('www.youtu.be/6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('youtu.be/6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('youtube.com/watch?v=6FjfewWAGdE') . "n";
echo $youtubeID = GetYoutubeID('https://www.youtube.com/watch?v=6FjfewWAGdE&feature=youtu.be') . "n";
	
preg_match('/^(http://|https://|.*?)(www.|.*?)(youtube.com|youtu.be)/(embed/|watch?v=|.*?)(.*?)(?|&|$)/is', $url, $matches);
if(isset($matches[5])) {
    return $matches[5];
}

return "no ID?"
	
function GetYoutubeID(url) {
    var regExp = /^(http://|https://|.*?)(www.|.*?)(youtube.com|youtu.be)/(embed/|watch?v=|.*?)(.*?)(?|&|$)/;
    var match = url.match(regExp);
    if (match){
        return match[5];
    }

    return "no ID?";
}

console.log(GetYoutubeID('http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage'));
console.log(GetYoutubeID('http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage'));
console.log(GetYoutubeID('https://www.youtube.com/embed/6FjfewWAGdE'));
console.log(GetYoutubeID('https://youtube.com/embed/6FjfewWAGdE'));
console.log(GetYoutubeID('http://www.youtube.com/watch?v=6FjfewWAGdE'));
console.log(GetYoutubeID('http://www.youtube.com/watch?v=6FjfewWAGdE&feature=player_detailpage'));
console.log(GetYoutubeID('www.youtu.be/6FjfewWAGdE'));
console.log(GetYoutubeID('youtu.be/6FjfewWAGdE'));
console.log(GetYoutubeID('youtube.com/watch?v=6FjfewWAGdE'));
console.log(GetYoutubeID('https://www.youtube.com/watch?v=6FjfewWAGdE&feature=youtu.be'));