VBA正则笔记 理解肯定环视

之前没有理解好，还以为是学习笔记有谬误。

'VBA正则笔记 肯定环视
Public Sub RegExHandle()
    Dim Regex As Object
    Dim Mh As Object, OneMh As Object
    Dim Text As String
    Text = "Halo world!"
    Set Regex = CreateObject("VBScript.RegExp")
    With Regex
        .Global = True
        '.MultiLine = False
        .Pattern = "(?=Ha)w+"   'Halo
        .Pattern = "w+(?=lo)"  'Ha
    End With
    If Regex.Test(Text) Then
        Set Mh = Regex.Execute(Text)
        For Each OneMh In Mh
            Debug.Print OneMh.Value
        Next
    End If
    Set Regex = Nothing
End Sub

.Pattern = "(?=Ha)w+" 得到的字符串是 Halo，模式(?=Ha)是指从H前面的位置开始匹配，且不消耗Ha两个字符，因此得到的就是Halo。

.Pattern = "w+(?=lo)" 得到的字符串是  Ha ，模式(?=lo)是指匹配截止到字符l前面的位置为止，且不消耗lo两个字符。

而非捕获性分组 模式.Pattern = "(?:Ha)w+"   或.Pattern = "w+(?:lo)"都可以匹配字符串Halo