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How to return list of all values that have matching first 4 characters

I have a large list of product ID’s setup up in the following format;

SKU
1002NAV
1003BLU
1007PNB
1008NAV
1009NAV
1010BLK
1010BLU
1011BLU
1011BUR
1011GRY
1011NAV

The first 4 numbers representing the style of product and corresponding 3 letters representing the colour, as a result any products that have the same 4 number style ID will be identical products (just different colours)

I would like to return a list of all full product ID’s that have multiple styles in order to group them, so the above list would return something like;

SKU
1010BLK
1010BLU
1011BLU
1011BUR
1011GRY
1011NAV

It would ignore the other SKU’s such as 1002NAV as there is only one style of this product.

I have a little knowledge of python as well if this cannot be done in excel but would prefer to keep it all within excel if possible.

Thank you.

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Answer

Assuming your input is a list of unique SKU’s, try:

enter image description here

Formula in B1:

=FILTER(A1:A11,COUNTIF(A1:A11,LEFT(A1:A11,4)&"*")>1,"")
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