http.*?//[^/]+/([^/]+)/.*$
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Option Explicit

Test

'************************************************************************
Sub Test()
'************************************************************************

    Dim str, strPattern
    str = "https://agc.qq.com/show/chan"
    strPattern = "http[s]{0,1}:\/\/[0-9A-z\.]+?\/([^\/]+)?[\/]{0,1}?.*"
    MsgBox GetRE_SM0(str, strPattern)

End Sub

'************************************************************************
'正則表達式：取得字符串的第一個子匹配項目
'************************************************************************
Function GetRE_SM0(ByVal str, ByVal strPattern)
    Dim oRE
    Set oRE = CreateObject("vbScript.regExp")
    oRE.Pattern = strPattern
    If oRE.Test(str) Then
        If oRE.Execute(str)(0).SubMatches.Count >= 1 Then
            GetRE_SM0 = oRE.Execute(str)(0).SubMatches(0)
        End If
    End If
    Set oRE = Nothing
End Function
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echo https://agc.qq.com/show/chan|perl -e "print [split(/\/+/,<>)]->[2]"
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$s = 'https://agc.qq.com/show/chan';
$s =~ /\/{2}.*?\/([^\/]+)/;
print $1;
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(?!/).*/([^/]+)/.*
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