add item to array in vba

I am looping through a recordset and where an instr is found I want to add that item to aliasarray but it wont allow, i am not sure how do deal with this as the size of the array is as of yet unknown  

I thought referencing it directly it would add the string.
Do Until RstAlias.EOF
           
            If InStr(Me.[DecodeResult].Value, .Fields("sClientDescGroup").Value) <> 0 Then
           
                AliasArray(index) = .Fields("sDesc").Value
                index = index + 1
            Else
           
           
            End If
       
       
       
        .MoveNext
        Loop
PeterBaileyUkAsked:
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Anthony BerenguelCommented:
Try using Redim Preserve AliasArray(Index +1) as [datatype] before trying to assign a value to a position in the array.

so it would look like this
Redim Preserve AliasArray(Index +1)  as [datatype]
AliasArray(index) = .Fields("sDesc").Value
index = index + 1

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