Excel VBA: Compare Delimited String in Cell to Column of Values - excel

Question

I have a list of (semi-colon delimited) genes within column B I want to create from that list, a list of the genes which are found in Column A.
| Keep | List | | Result |
|------------------|----------------------------|---|-------------|
| AASS;SESN1;SEPT5 | AASS | | AASS |
| | ARMC2;SESN1;ARMC2AS1;SEPT5 | | SESN1;SEPT5 |
| | | | |
I have a start on a code, but it only appears to work for some of the gene lists, but not all.
For example, the lists in cells B2 and B3 are extracted to Column C correctly, but cell B4 ends up with 7 extra terms (but running the VBA Script a second time results in the correct number & composition), and B5 results in a strange output "4;5;0;2;3;1;SNORD1161" in D5.
This the code that I have so far, and it was modified from: https://www.mrexcel.com/forum/excel-questions/654920-match-comma-delimited-values-cell-against-individual-values-column.html
Any help would be appreciated! Thanks!
Sub matchups2()
Dim regex_leading As New VBScript_RegExp_55.RegExp
Dim regex_middle As New VBScript_RegExp_55.RegExp
Dim regex_trailing As New VBScript_RegExp_55.RegExp
Set d = CreateObject("scripting.dictionary")
For Each gene In Range("A2", Cells(Rows.Count, "A").End(3)).Value
d(gene) = 1
Next gene
Stop
For Each genelist In Range("B2", Cells(Rows.Count, "B").End(3))
c = genelist.Value
k = genelist.Row
For Each q In Split(c, ";")
If d(q) <> 1 Then
c = Replace(c, q, ";")
End If
Next q
regex_leading.Pattern = "^;{1,}"
With regex_middle
.Pattern = ";{1,}"
.Global = True
End With
regex_trailing.Pattern = ";{1,}$"
c = regex_leading.Replace(c, "")
c = regex_middle.Replace(c, ";")
c = regex_trailing.Replace(c, "")
Cells(k, "D").Value = c
Next genelist
End Sub

Answer 1

I think this should work for you.
Sub GenesDict()
Dim dict As Object
Set dict = CreateObject("Scripting.Dictionary")
'add A genes to dictionary
Dim i As Long
For i = 2 To Cells(Rows.Count, "A").End(xlUp).Row
Dim temp As Variant
temp = Split(Cells(i, "A").Value2, ";")
Dim j As Long
For j = LBound(temp) To UBound(temp)
dict.Add Trim(temp(j)), "text"
Next j
Next i
'clear D
Range("D2:D" & Range("D" & Rows.Count).End(xlUp).Row).ClearContents
'transfer from B to D only genes in A
For i = 2 To Cells(Rows.Count, "B").End(xlUp).Row
temp = Split(Cells(i, "B").Value2, ";")
For j = LBound(temp) To UBound(temp)
If dict.exists(Trim(temp(j))) Then
Cells(i, "D").Value2 = Cells(i, "D").Value2 & Trim(temp(j)) & ";"
End If
Next j
'remove trailing ";"
If Right(Cells(i, "D").Value2, 1) = ";" Then
Cells(i, "D").Value2 = Left(Cells(i, "D").Value2, Len(Cells(i, "D").Value2) - 1)
End If
Next i
End Sub