请教:这段程序实现什么功能呢
Function sReplace(SearchLine As String, SearchFor As String, ReplaceWith As String)Dim vSearchLine As String, found As Integer
found = InStr(SearchLine, SearchFor): vSearchLine = SearchLine
If found <> 0 Then
vSearchLine = ""
If found > 1 Then vSearchLine = Left(SearchLine, found - 1)
vSearchLine = vSearchLine + ReplaceWith
If found + Len(SearchFor) - 1 < Len(SearchLine) Then _
vSearchLine = vSearchLine + Right$(SearchLine, Len(SearchLine) - found - Len(SearchFor) + 1)
End If
sReplace = vSearchLine
End Function