设置方法：
登陆论坛后台–style–editor setting–discuz！ code 添加youtube项并上传小图标至images/common 目录内；
在details 里设置 替换内容 为
最后设置youtube项为 Available Display
此时会员发帖时编辑器上会出现youtube按钮，会员需输入视频id，即分享地址（http://www.youtube.com/watch?v=6WgMwd6AgU0）中的6WgMwd6AgU0，为方便会员输入需要修改include/discuzcode.func.php文件
7.2修改方法
preg_replace(array(
"/\[color=([#\w]+?)\]/i",
"/\[size=(\d+?)\]/i",
"/\[size=(\d+(\.\d+)?(px|pt|in|cm|mm|pc|em|ex|%)+?)\]/i",
"/\[font=([^\[\<]+?)\]/i",
"/\[align=(left|center|right)\]/i",
"/\[p=(\d{1,2}), (\d{1,2}), (left|center|right)\]/i",
"/\[float=(left|right)\]/i",
"#\[youtube\]http://(?:www\.)?youtube.com/watch\?v=([0-9A-Za-z-_]{11})[^[]*\[\/youtube\]#is" //此行为添加代码
), array(
"",
"",
"",
"",
"",
"
",
"",
"[youtube]\\1[/youtube]" //此行为添加代码
)
6.0修改方法
$discuzcodes['searcharray']['bbcode_regexp'] = array(
"#\[youtube\]http://(?:www\.)?youtube.com/watch\?v=([0-9A-Za-z-_]{11})[^[]*\[\/youtube\]#is", //此行为添加代码
"/\[url\]\s*(www.|https?:\/\/|ftp:\/\/|gopher:\/\/|news:\/\/|telnet:\/\/|rtsp:\/\/|mms:\/\/|callto:\/\/|bctp:\/\/|ed2k:\/\/|thunder:\/\/|synacast:\/\/){1}([^\[\"']+?)\s*\[\/url\]/ie",
"/\[url=www.([^\[\"']+?)\](.+?)\[\/url\]/is",
"/\[url=(https?|ftp|gopher|news|telnet|rtsp|mms|callto|bctp|ed2k|thunder|synacast){1}:\/\/([^\[\"']+?)\](.+?)\[\/url\]/is",
"/\[email\]\s*([a-z0-9\-_.+]+)@([a-z0-9\-_]+[.][a-z0-9\-_.]+)\s*\[\/email\]/i",
"/\[email=([a-z0-9\-_.+]+)@([a-z0-9\-_]+[.][a-z0-9\-_.]+)\](.+?)\[\/email\]/is",
"/\[color=([#\w]+?)\]/i",
"/\[size=(\d+?)\]/i",
"/\[size=(\d+(\.\d+)?(px|pt|in|cm|mm|pc|em|ex|%)+?)\]/i",
"/\[font=([^\[\<]+?)\]/i",
"/\[align=(left|center|right)\]/i",
"/\[float=(left|right)\]/i"
);
$discuzcodes['replacearray']['bbcode_regexp'] = array(
"[youtube]\\1[/youtube]", //此行为添加代码
"cuturl('\\1\\2')",
"\\2",
"\\3",
"\\1@\\2",
"\\3",
"",
"",
"",
"",
"",
""
);
经过修改会员在添加youtube视频时可以直接输入视频分享地址（http://www.youtube.com/watch?v=6WgMwd6AgU0）即可
参考地址：http://www.alan888.com/Discuz/thread-160793-1-1.html