excel - InStr(1, cell.Value, "-") doesn't seem to be working with Not -

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i have conditional doesn't seem work.

if not instr(1, cell.value, "-")     'do else     'do else end if

where cell.value either numbers in spreadsheet dash: "6621-123", or without dash: "555321"

the first if let's both through , else ignored. ideas why isn't working?

instr returns 0 on no match (not -1 vba string indexes 1 based) , not 0 true (-1); other possible values > 0 can returned.

if instr(1, cell.value, "-") = 0     '// not present else     '// present

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