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b="µ¥Î»¹¤³ÌÃû³Æ"
c="µ¥Î»"
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if instr(a,b) and instr(a,c)=0 then 
  '....
end if

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VB code:

Option Explicit

Function StringComp(ByVal s As String, sFind1 As String, sFind2 As String) As Long
'µÚÒ»¸ö´æÔÚ·µ»Ø1,µÚ¶þ¸ö´æÔÚ·µ»Ø2,¶þ¸ö¶¼´æÔÚ·µ»Ø3,¶þ¸ö¶¼²»´æÔÚ,·µ»Ø0
Const SEPARATOR = ","
s = SEPARATOR & s & SEPARATOR
sFind1 = SEPARATOR & sFind1 & SEPARATOR
sFind2 = SEPARATOR & sFind2 & SEPARATOR
StringComp = -(InStr(s, sFind1) > 0) + -2 * (InStr(s, sFind2) > 0)

End Function

Private Sub Command1_Click()
Dim a As String, b As String, c As String

a = "¹¤³Ì±àºÅ,µ


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