sbMatchCheck

Sometimes unexperienced Excel © users apply a Match or Vlookup or Hlookup worksheet function with a last parameter True or 1 (this is the comparison type which expects a sorted lookup area), but their lookup area is not sorted ascending.
The UDF below is checking this.
Please read my Disclaimer.
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Function sbMatchCheck(r As Range) As Variant
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' sbMatchCheck analyzes the worksheet formula
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' in cell r and warns if a Match or H/Vlookup formula
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' with last argument True, 1 or similar has been used
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' and if the data (lookup) area is not sorted ascending.
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' Return codes:
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' 0 = Nothing to check, comparison parameter is 0 or
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'     data area is sorted
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' #Value! = Match or H/Vlookup function with last parameter 1
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'     and unsorted data area
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' Reverse("moc.LiborPlus.www") V0.11 PB 23-Feb-2014
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Dim blFirst As Boolean
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Dim sFormula() As String
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Dim lMatchType As Long ' Can be Integer but I only use Long
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Dim lPar As Long ' Can be Integer but I only use Long
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Dim v As Variant, vOld As Variant
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sFormula = Split(r.Formula & ",1)", ",")
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sFormula(0) = Left(sFormula(0), InStr(sFormula(0) & "(", "(") - 1)
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Select Case sFormula(0)
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    Case "=VLOOKUP", "=HLOOKUP"
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        lPar = 3
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    Case "=MATCH"
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        lPar = 2
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    Case Else
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        ' Neither Match nor Vlookup function: nothing to check
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        sbMatchCheck = 0
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        Exit Function
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End Select
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If sFormula(lPar) = ")" Then
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    sFormula(lPar) = "0)"
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End If
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lMatchType = Sgn(Evaluate(Left(sFormula(lPar), _
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    InStr(sFormula(lPar), ")") - 1)))
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If lMatchType <> 0 Then
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    blFirst = True
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    If UBound(sFormula) = lPar Then
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        sFormula(1) = Left(sFormula(1), Len(sFormula(1)) - 1)
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    End If
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    For Each v In Range(sFormula(1))
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        If blFirst Then
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            vOld = v
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            blFirst = False
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        Else
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            If (v > vOld And lMatchType < 0) Or _
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                (v < vOld And lMatchType > 0) Then
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                sbMatchCheck = CVErr(xlErrValue)
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                Exit Function
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            End If
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            vOld = v
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        End If
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    Next v
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Else
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    ' Last parameter is False / 0: nothing to check
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    sbMatchCheck = 0
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End If
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End Function
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