主题：请教老师字符匹配标识要如何实现

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If e.Col.name = "产品功效" Then
    Dim drs = DataTables("禁用词").Select("")
    Dim cval As String = e.Row(e.Col.Name)
    e.text = ""
    Dim g As Graphics = e.Graphics
    Dim fnt As New Font("宋体",e.Table.Font.Size, FontStyle.Bold)
    Dim x As Integer = e.x + 1
    Dim y As Integer = e.Y + 1
    Dim idx As Integer = 0
   
    Do While idx > -1
        idx = -1
        Dim val As String = ""
        For Each dr As DataRow In drs
            Dim v = dr("禁用词")
            Dim i = cval.IndexOf(v)
            If i > -1 Then
                If idx = -1 Then
                    idx = i
                    val = v
                ElseIf i < idx Then
                    idx = i
                    val = v
                End If
            End If
        Next
        If idx > -1 Then
            Dim temp As String = cval.SubString(0,idx)
            g.DrawString(temp,e.Table.Font,Brushes.black, x, y)
            x += g.MeasureString(temp, e.Table.Font).width-3
            g.DrawString(val,fnt,Brushes.Red, x, y)
            x += g.MeasureString(val, fnt).width-1
            cval = cval.SubString(idx+Val.Length)
        End If
    Loop
    g.DrawString(cval,e.Table.Font,Brushes.black, x, y)
End If 

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