Look Values in column 1 and bring column 2 values

Question

my data set looks like

Col A   
A/05702; A/05724; A/05724;A/05724;A/05725;A/05725;
corresponding Col B
1;1;2;3;1;3;

I am trying to get the

Answer 1

You can use this simple UDF:

Function TEXTJOIN(delim As String, skipblank As Boolean, arr) As String
    Dim d
    For Each d In arr
        If d <> "" Or Not skipblank Then
            TEXTJOIN = TEXTJOIN & d & delim
        End If
    Next d
    TEXTJOIN = Left(TEXTJOIN, Len(TEXTJOIN) - 1)
End Function

Make sure to put it in a module attached to the desired workbook and NOT in the worksheet code or in ThisWorkbook code.

It is then called like this:

=TEXTJOIN(",",TRUE,IF($A$1:$A$6 = $C1, $B$1:$B$6, ""))

Entered as an Array formula with Ctrl-Shift-Enter. If done correctly Excel will put {} around the formula.

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NOTE

If you have Office 365 the UDF is not needed as it exists in Excel, Just enter the formula as an array.

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Alternative

If you want a formula only approach AND your data is sorted then you will need a "helper column". I put mine in Column C. In C1 I put:

=IF(A2<>A1,B1,B1&"," &C2)

Which gave me:

Then a simple VLOOKUP will return what we want:

=VLOOKUP(E1,A:C,3,FALSE)