经典ASP - 从String中提取URL

Question

尝试仅在文本字符串中的两个引号之间拉取URL。我希望以“www.youtube.com/embed/abcdefg”结尾。目前，EndURL拉0，这意味着它没有找到双引号。

Link_Youtube = <iframe width="560" height="315" src="//www.youtube.com/embed/abcdefg" frameborder="0" allowfullscreen></iframe>

StartURL =  Instr(Link_Youtube,"src=")
EndURL =    Instr(startURL+7, Link_Youtube, Instr(Link_Youtube,""""))
Link_Youtube = Mid(Link_Youtube, startURL+6, EndURL)

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更新（正常工作）代码：

If Instr(Link_Youtube,"iframe") > 0 Then    'embed
    startURL =  Instr(Link_Youtube,"src=")+7
    EndURL =    Instr(startURL, Link_Youtube, """") - startURL
    Link_Youtube = Mid(Link_Youtube, startURL, EndURL)
End If