Count occurrences of a character in a string

This function lets you determine the number of times a character occurs in a string

    Function StringCountOccurrences(strText As String, strFind As String, _
    Optional lngCompare As VbCompareMethod) As Long
' Counts occurrences of a particular character or characters.
' If lngCompare argument is omitted, procedure performs binary comparison.
'Testcases:
'?StringCountOccurrences("","") = 0
'?StringCountOccurrences("","a") = 0
'?StringCountOccurrences("aaa","a") = 3
'?StringCountOccurrences("aaa","b") = 0
'?StringCountOccurrences("aaa","aa") = 1
Dim lngPos As Long
Dim lngTemp As Long
Dim lngCount As Long
If Len(strText) = 0 Then Exit Function
If Len(strFind) = 0 Then Exit Function
lngPos = 1
Do
lngPos = InStr(lngPos, strText, strFind, lngCompare)
lngTemp = lngPos
If lngPos > 0 Then
lngCount = lngCount + 1
lngPos = lngPos + Len(strFind)
End If
Loop Until lngPos = 0
StringCountOccurrences = lngCount
End Function