README.md

Public Sub KMPSearch(ByVal pattern As String, ByVal text As String)
    Dim M As Integer
    Dim N As Integer
    Dim lps() As Integer
    Dim j As Integer
    Dim i As Integer

    ' Inicialización
    M = Len(pattern)
    N = Len(text)
    ReDim lps(M)
    j = 0

    ' Calcular la tabla LPS (Longest Prefix Suffix)
    ComputeLPSArray pattern, M, lps

    ' Búsqueda
    i = 0
    While i < N
        If pattern(j) = text(i) Then
            j = j + 1
            i = i + 1
        End If

        If j = M Then
            Debug.Print "Patrón encontrado en el índice " & (i - j)
            j = lps(j - 1)
        ElseIf i < N And pattern(j) <> text(i) Then
            If j <> 0 Then
                j = lps(j - 1)
            Else
                i = i + 1
            End If
        End If
    Wend
End Sub

Private Sub ComputeLPSArray(ByVal pattern As String, ByVal M As Integer, ByRef lps() As Integer)
    Dim length As Integer
    Dim i As Integer

    length = 0
    i = 1
    lps(0) = 0

    While i < M
        If pattern(i) = pattern(length) Then
            length = length + 1
            lps(i) = length
            i = i + 1
        Else
            If length <> 0 Then
                length = lps(length - 1)
            Else
                lps(i) = length
                i = i + 1
            End If
        End If
    Wend
End Sub