modify current formula to add additional step

Hi Experts

I have the following formula =IF(AND(LEN(C2)=7,OR(ISNUMBER(SEARCH("o",LEFT(C2,1),1)),ISNUMBER(SEARCH("e",LEFT(C2,1),1)))),SUBSTITUTE(C2,C2,"-"),C2)

Which works fine...I need to amend it so if we have either 7 or 8 number and letter comb
The end results is

1. o123456 equal "" work
2. 01234567 equal """ plus step one also..
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pls try


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Microsoft Excel

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