The VBA Replace function is great, but it has limitations. It’s easy to use it to replace all occurrences, the first occurrence, and the last occurrence, but it’s hard to use it to replace instances of a substring in the middle of a string.
That’s where this ReplaceN function comes in handy! This UDF replaces the Nth occurrence of a substring in a string with VBA. It combines the Mid, InStr and Replace string manipulation functions to create one handy function. Use it to replace the 2nd, 3rd, 4th or more instance of a string within another string.
Replace Nth Occurrence of substring in a string
Function ReplaceN(ByVal str1 As Variant, strFind As String, strReplace As String, N As Long, Optional Count As Long) As String Dim i As Long, j As Long Dim strM As String strM = str1 If Count <= 0 Then Count = 1 For i = 1 To N - 1 j = InStr(1, strM, strFind) strM = Mid(strM, j + Len(strFind), Len(strM)) Next i If N <= 0 Then ReplaceN = str1 Else ReplaceN = Mid(str1, 1, Len(str1) - Len(strM)) & Replace(strM, strFind, strReplace, Start:=1, Count:=Count) End If End Function
How to use the ReplaceN Function
Here’s an example of how to use the ReplaceN function:
Replace 2nd occurrence of substring in a string
Sub VBA_Replace1() str1 = "One fish, two fish, red fish, blue fish" str1 = ReplaceN(str1, "fish", "cat", 2) End Sub
This macro replaces the 2nd instance of “fish” in a string with the word “cat.” It changes the string from
One fish, two fish, red fish, blue fish
One fish, two cat, red fish, blue fish
Use ReplaceN in an Excel Spreadsheet Cell
You can also use the ReplaceN function directly in your spreadsheet by entering it in a cell in Excel. Just type a formula like
=ReplaceN(A1,"fish","cat",2) into any cell and watch it work its magic.
Replace middle 2 instances of a string starting with the 2nd occurrence
Notice I included an optional argument titled Count. This can be any positive integer. Unlike the normal VBA Replace function, the default of my function is to just replace 1 occurrence. Whatever number you put here, the function will replace that many of your substrings beginning with the Nth instance you defined in variable N.
For example, if you put
Sub VBA_Replace1() str1 = "One fish, two fish, red fish, blue fish" str1 = ReplaceN(str1, "fish", "cat", 2, 2) End Sub
str1 would be changed to
One fish, two cat, red cat, blue fish
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Ryan Wells is a Nuclear Engineer and professional VBA Developer. He is the lead developer of several VBA applications, including PDF VBA - a leading Excel Add-in for exporting Excel Objects, like charts and tables, to PDFs. Discover more of his popular Excel Add-ins, including Mouse To Macro and CF Shapes, at his dedicated Excel Add-ins page.Follow