Excel Extract nth first words from a string - excel

Question

I'd like to create a function in vba to extract the first nth words from a string and to look like this
ExtractWords(affected_text, delimiter, number_of_words_to_extract)
I tried a solution but it only extracts the first two words.
Function FirstWords(myStr As Variant, delimiter,words_to_extract) As Variant
FirstWords = Left(myStr, InStr(InStr(1, myStr, delimiter) + 1, myStr, delimiter, vbTextCompare) - 1)
End Function
Any ideas? Thanks

Answer 1

Use Split() function. It returns array of String, split using the delimiter and limit of words you specify.
Dim Result As Variant
Result = Split("Alice,Bob,Chuck,Dave", ",") 'Result: {"Alice,"Bob","Chuck","Dave"}
Result = Split("Alice,Bob,Chuck,Dave", ",", 2) 'Result: {"Alice,"Bob"}

Answer 2

#Taosique's answer using Split is excellent, but if you want the result returned as a string you can do the following:
Function FirstWords(myStr As String, delimiter As String, words_to_extract As Long) As Variant
Dim i As Long, k As Long
For i = 1 To Len(myStr)
If Mid(myStr, i, 1) = delimiter Then
k = k + 1
If k = words_to_extract Then
FirstWords = Mid(myStr, 1, i)
Exit Function
End If
End If
Next I
'if you get to here -- trouble
'unless the delimiter count is words_to_extract - 1
If k = words_to_extract - 1 Then
FirstWords = myStr
Else
FirstWords = CVErr(xlErrValue)
End If End Function
Sub test()
Debug.Print FirstWords("This is a test. I hope it works", " ", 4)
Debug.Print FirstWords("This is a test. I hope it works", " ", 10)
End Sub
When test is run it first displays the string "This is a test." then prints an error condition.
Much the same effect as the above can be achieved by first splitting the string using Split and then rejoining it using Join. A subtle difference is the behavior if there are less than words_to_extract words. The Split then Join approach will return the whole string. The above code treats this as an error condition and, if used as a UDF worksheet function, will display #VALUE! in any cell that contains it.