c# – 通过不引人注意的验证识别有效的youtube网址正则表达式在M

我的模型中有这个代码

MultimediaLanguageEdit.cs

public class MultimediaLanguageEdit
{ 
    //[RegularExpression(@"((?<=^https?://(www.)?youtube.com/.*v=)w+)|((?<=^https?://youtu.be/)w+)|((?<=src=""https?://(www.)?youtube.com/v/)w+)|((?<=src=""https?://(www.)?youtube.com/embed/)w+)",[RegularExpression(@"(^https?://(www.)?youtube.com/.*v=w+)|(^https?://youtu.be/w+)|(src=.https?://(www.)?youtube.com/v/w+)|(src=.https?://(www.)?youtube.com/embed/w+)",ErrorMessageResourceType = typeof(ErrorMessages),ErrorMessageResourceName = "FieldRegExp")]
    public string Text { get; set; }
}

这个代码在我的视图中

MultimediaLanguageEdit.cshtml

@model MultimediaLanguageEdit

<div class="editor-label">
    @Html.LabelFor(m => m.Text,"Codice HTML:")
</div>
<div class="editor-field">
    @Html.TextAreaFor(m => m.Text)
    @Html.ValidationMessageFor(m => m.Text)
</div>

并且该字段对于所有这些案例测试始终无效

> http://www.youtube.com/watch?v=tYTIo6H19uw&feature=grec_index
>< iframe width =“560”height =“315”src =“http://www.youtube.com/embed/tYTIo6H19uw”frameborder =“0”allowfullscreen>< / iframe>
>< object width =“560”height =“315”>
???< param name =“movie”value =“http://www.youtube.com/v/tYTIo6H19uw?version=3u0026amp;amp;hl=it_IT”>< / param>< param name =“allowFullScreen”值= “真” >< / PARAM>
???< param name =“allowscriptaccess”value =“always”>< / param>
???< embed src =“http://www.youtube.com/v/tYTIo6H19uw?version=3u0026amp;amp;hl=it_IT”type =“application / x-shockwave-flash”width =“560”height =“315 “allowscriptaccess =”always“allowfullscreen =”true“>< / embed>
< /对象>

并匹配此测试用例

> http://youtu.be/tYTIo6H19uw

但如果我在custom editor甚至控制器中测试正则表达式,我的每个案例都有一个匹配.

这段代码有什么问题？