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Extracting Text From String Vba

I need to extract the text from a string that is always less the last three digits. For example if A1 is abcdefg I always have to take off "efg" and extract the rest of it to the left but the length of the string can vary. I can be dirty and record a macro where I find the length, subtract 3 and then using the LEFT worksheet function can get my result, but when I come to try to convert that to VBA. What is the VBA equivalent of LEFT worksheet function and how would I go about using LEN in conjuntion with subtracting 3 from it?

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You can see that in this further example "A10C" & "M1A1" are 4 character alphanumeric strings wheras the others feature 3 characters.

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