Count string within string using VBA - string

Question

I have product codes: (they are in C column of active sheet)
DO-001
DO-002
DO-003
DO-004
And I have big list of data: (they are in C column of "Sheet1")
41300100_DO-001_14215171
41300104_DO-001_14215173
K1_ISK_41300661_DO-002_13190369
NP_41533258_DO-003_14910884
DO-003_DD_44_ddd
And I want to count how many times do the product codes appear in the list of data. So the result for this case'd be: (result is H column of active sheet)
DO-001 2
DO-002 1
DO-003 2
DO-004
I have done this with this code:
Sub CountcodesPLC()
Dim i, j As Integer, icount As Integer
Dim ldata, lcodes As Long
icount = 0
lcodes = Cells(Rows.Count, 3).End(xlUp).Row
ldata = Worksheets("Sheet1").Cells(Rows.Count, 3).End(xlUp).Row
For i = 10 To lcodes
For j = 2 To ldata
If InStr(Worksheets("Sheet1").Range("C" & j), Range("C" & i)) <> 0 Then
icount = icount + 1
End If
Next j
If icount <> 0 Then
Range("H" & i).Value = icount
End If
icount = 0
Next i
End Sub
But I want to change it, so if the list of data contains some key words like "NP", "ISK", then not to count them, or if the first part of the data is the code then also not to count them, so the result for this example would be:
DO-001 2
DO-002
DO-003
DO-004
Also, I'll have around 1.000 product codes, and around 60.000 strings of data.
Will my code crash?

Answer 1

Seems your code is OK. But if you want to match only the first part of string (a'ka StartsWith), i'd change only this line:
If InStr(Worksheets("Sheet1").Range("C" & j), Range("C" & i)) <> 0 Then
to:
If Worksheets("Sheet1").Range("C" & j) Like Range("C" & i) & "*" Then
For further details, please see: Wildcard Characters used in String Comparisons

Answer 2

Use Dictionnary
Dim Dict As Scripting.Dictionary
Set Dict = New Scripting.Dictionary
Arr = Split("refer your text here", "_")
For I = LBound(Arr) To UBound(Arr)
If Dict.Exists(Arr(I)) Then
Dict(Arr(I)) = Dict(Arr(I)) + 1 'increment
Else
Dict.Add Arr(I), 1
End If
Next I

Answer 3

This may be OTT for the requirement but should work quite quickly.
Public Sub Sample()
Dim WkSht As Worksheet
Dim LngRow As Long
Dim AryLookup() As String
Dim VntItem As Variant
'We put what we want to search into an array, this makes it a lot quicker to search
Set WkSht = ThisWorkbook.Worksheets("Sheet1")
ReDim AryLookup(0)
LngRow = 1
Do Until WkSht.Range("A" & LngRow) = ""
If AryLookup(UBound(AryLookup, 1)) <> "" Then ReDim Preserve AryLookup(UBound(AryLookup, 1) + 1)
AryLookup(UBound(AryLookup, 1)) = Trim(UCase(WkSht.Range("A" & LngRow)))
LngRow = LngRow + 1
Loop
Set WkSht = Nothing
'Then we go down the list and check the array against each item
Set WkSht = ActiveSheet
LngRow = 1
Do Until WkSht.Range("A" & LngRow) = ""
WkSht.Range("B" & LngRow) = 0
For Each VntItem In AryLookup()
'This looks for the match without any of the exclusion items
If (InStr(1, VntItem, Trim(UCase(WkSht.Range("A" & LngRow)))) <> 0) And _
(InStr(1, VntItem, "NP") = 0) And _
(InStr(1, VntItem, "ISK") = 0) Then
WkSht.Range("B" & LngRow) = WkSht.Range("B" & LngRow) + 1
End If
Next
LngRow = LngRow + 1
Loop
Set WkSht = Nothing
MsgBox "Done"
End Sub
Basically, the 60,000 data strings will go into an array in memory, then the array will be searched against the 1,000 products. Searching in memory should be quick.
One thing I would raise is the exclusion method may produce false positives.
For example, excluding NP will exclude: -
NP_41533258_DO-003_14910884
NPA_41533258_DO-003_14910884
41533258_ANP_DO-003_14910884
You may want to think about the method overall.

Answer 4

Have you considered an array formula, not sure how it will perform vs code, but, you could do something along these lines, where list is in A and prod numbers in B
=SUM(IF(NOT(ISERR(SEARCH(B1 & "_",$A$1:$A$5,1)))*(ISERR(SEARCH("NP_",$A$1:$A$5,1))),1,0))
Where "NP" would be replaced by a range containing the exclusions, I've left as NP to show what's happening.

Answer 5

The code would be like this. But I don't know the speed.
Sub test()
Dim vDB, vLook, vSum(), Sum As Long
Dim Ws As Worksheet, dbWs As Worksheet
Dim s As String, sF As String, sCode As String
Dim i As Long, j As Long, n As Long
Set dbWs = Sheets("Sheet1")
Set Ws = ActiveSheet
With Ws
vLook = .Range("a1", .Range("a" & Rows.Count).End(xlUp))
End With
With dbWs
vDB = .Range("c1", .Range("c" & Rows.Count).End(xlUp))
End With
n = UBound(vLook, 1)
ReDim vSum(1 To n, 1 To 1)
For i = 1 To n
sF = Split(vLook(i, 1), "-")(0)
sCode = Replace(vLook(i, 1), sF, "")
Sum = 0
For j = 1 To UBound(vDB, 1)
s = vDB(j, 1)
If Left(s, Len(sF)) = sF Or InStr(s, "NP") Or InStr(s, "ISK") Then
Else
If InStr(s, sCode) Then
Sum = Sum + 1
End If
End If
Next j
If Sum > 0 Then
vSum(i, 1) = Sum
End If
Next i
Ws.Range("h1").Resize(n) = vSum
End Sub