Check if a value is in an array or not with Excel VBA

I've got some code below, that is supposed to be checking if a value is in an Array or not.

Sub test()
    vars1 = Array("Examples")
    vars2 = Array("Example")
    If IsInArray(Range("A1").Value, vars1) Then
        x = 1
    End If

    If IsInArray(Range("A1").Value, vars2) Then
        x = 1
    End If
End Sub

Function IsInArray(stringToBeFound As String, arr As Variant) As Boolean
  IsInArray = (UBound(Filter(arr, stringToBeFound)) > -1)
End Function

If the cell A1 contains the word Examples for some reason both of the IsInArray detects it as existing for both Arrays when it should only find it existing in the vars1 array

What do I need to change to make my IsInArray function to make it an exact match?