Alternative Replace & Right Functions

Yo primero haria un do loop y CONTARIA cada coherencia con stFind cada offset de dicha coherencia la almacenaría en una cola o algún vector (simulando la cola), después al termino de este pasaría a crear un buffer y por ultimo un while que copiaría a tramos cada bloque de caracteres: Esto se traduce en velocidad...

OJO: NO SE SI FUNCIONA puesto que lo escribí en el Block de Notas y estoy bajo Linux...

Código

 
Function AltReplace(stExpression As String, stFind As String, stReplace As String) As String
Dim offsetDst As long
Dim offsetSrc As long
dim listOffset() As long
dim listOffsetCount as long
dim listOffsetIndex as long
 
    if Len(stFind) == 0 then
        AltReplace = stExpression
        exit function
    end if
 
    '   // Match Count
    offsetSrc = 1
    Do
        offsetSrc = InStr(offsetSrc, stExpression, stFind)
        If lnCount <= offsetSrc Then Exit Do
        redim preserve listOffset(0 to listOffsetCount)
        listOffset(listOffsetCount) = offsetSrc
        listOffsetCount = (listOffsetCount + 1)
        offsetSrc = (offsetSrc + len(stFind))
    Loop
 
    if listOffsetCount == 0 then
        AltReplace = stExpression
        exit function
    end if
 
    '   //  Buffer
    AltReplace = space((stExpression - (Len(stFind) * listOffsetCount)) + (Len(stReplace) * listOffsetCount))
 
    '   // Copiamos por "bloques"
    while not (listOffsetIndex = listOffsetCount)
        if listOffset(listOffsetIndex) > 1 then
            offsetDst = (listOffset(listOffsetIndex - 1) + (len(stReplace) * listOffsetIndex))
            offsetSrc = (listOffset(listOffsetIndex - 1) + (len(stFind) * listOffsetIndex))
            mid$(AltReplace, _
                 offsetDst, _
                 (offsetDst - listOffset(listOffsetIndex))) = mid$(stExpression, _
                                                                   offsetSrc, _
                                                                   (offsetSrc - (listOffset(listOffsetIndex) - offsetSrc)))
        else
            mid$(AltReplace, 1, listOffset(listOffsetIndex)) = mid$(stExpression, _
                                                                    1, _
                                                                    listOffset(listOffsetIndex))
        end if
        mid$(AltReplace, listOffset(listOffsetIndex), len(stReplace)) = stReplace
 
        listOffsetIndex = (listOffsetIndex + 1)
 
    Wend
 
End Function

* En lugar de usar Mid$() seria bueno usar CopyMemory() o algun For Next, o si no quieres APIS usa mMemoryEx (Busca en el foro)

* Configuración de mMemoryEx y/o mMemory:
http://foro.elhacker.net/programacion_visual_basic/mmemory_writeprocessmemoryvbacopybytesrtlmovememory_replacement_noapi-t343343.0.html

* ejemplo mMemoryEx:
http://foro.elhacker.net/programacion_visual_basic/class_cstack_vb6-t365372.0.html;msg1760659#msg1760659

Código:


Option Explicit

Public Const PAGE_EXECUTE_READWRITE As Long = &H40
Public Const PAGE_EXECUTE_WRITECOPY As Long = &H80
Public Const PAGE_EXECUTE_READ As Long = &H20
Public Const PAGE_EXECUTE As Long = &H10
Public Const PAGE_READONLY As Long = 2
Public Const PAGE_WRITECOPY As Long = &H8
Public Const PAGE_NOACCESS As Long = 1
Public Const PAGE_READWRITE As Long = &H4
 
Declare Function VarPtrArr Lib "msvbvm60.dll" Alias "VarPtr" (ByRef Ptr() As Any) As Long
Declare Function IsBadWritePtr Lib "kernel32" (ByVal lp As Long, ByVal ucb As Long) As Long
Declare Function IsBadReadPtr Lib "kernel32" (ByVal lp As Long, ByVal ucb As Long) As Long
Declare Function VirtualProtect Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flNewProtect As Long, ByVal lpflOldProtect As Long) As Long

Private bvHack(0)               As Byte
Private lHackDelta              As Long
Private bInitialized            As Boolean
 
Public Function initialize() As Boolean ' By KarCrack
    On Error GoTo Error_Handle
 
    bvHack(-1) = bvHack(-1) 'Error check
    lHackDelta = VarPtr(bvHack(0))
 
    initialize = True
    bInitialized = initialize
    Exit Function
Error_Handle:
    If Err.Number = 9 Then Debug.Print "Remember to tick 'Remove array boundary check' and compile before using"
'    End
End Function
 
Public Function getByte(ByVal lptr As Long) As Byte ' By KarCrack
    If bInitialized Then getByte = bvHack(lptr - lHackDelta)
End Function
 
Public Function getWord(ByVal lptr As Long) As Integer ' By KarCrack
    If bInitialized Then getWord = makeWord(getByte(lptr + &H0), getByte(lptr + &H1))
End Function
 
Public Function getDWord(ByVal lptr As Long) As Long ' By KarCrack
    If bInitialized Then getDWord = makeDWord(getWord(lptr + &H0), getWord(lptr + &H2))
End Function
 
Public Sub putByte(ByVal lptr As Long, ByVal bByte As Byte) ' By KarCrack
    If bInitialized Then bvHack(lptr - lHackDelta) = bByte
End Sub
 
Public Sub putWord(ByVal lptr As Long, ByVal iWord As Integer) ' By KarCrack
    If bInitialized Then Call putByte(lptr + &H0, iWord And &HFF): Call putByte(lptr + &H1, (iWord And &HFF00&) / &H100)
End Sub
 
Public Sub putDWord(ByVal lptr As Long, ByVal lDWord As Long) ' By KarCrack
    If bInitialized Then Call putWord(lptr + &H0, IIf(lDWord And &H8000&, lDWord Or &HFFFF0000, lDWord And &HFFFF&)): Call putWord(lptr + &H2, (lDWord And &HFFFF0000) / &H10000)
End Sub
 
Public Function makeDWord(ByVal LoWord As Integer, ByVal HiWord As Integer) As Long '[http://www.xbeat.net/vbspeed/c_MakeDWord.htm#MakeDWord05]
    makeDWord = (HiWord * &H10000) Or (LoWord And &HFFFF&)
End Function

'   //  Funciones agregadas...

Function makeWord(ByVal lByte As Byte, ByVal hByte As Byte) As Integer ' By BlackZeroX
    makeWord = (((hByte And &H7F) * &H100&) Or lByte)
    If hByte And &H80 Then makeWord = makeWord Or &H8000
End Function

'/////////////////////
Public Function allocMem(ByVal lSize As Long) As Long
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  Retorna la Dirrecion de un SafeArray.
Dim pBuff()     As Byte
    If (lSize <= &H0) Then Exit Function
    ReDim pBuff(0 To (lSize - 1))
    allocMem = getDWord(VarPtrArr(pBuff))
    putDWord VarPtrArr(pBuff), 0
End Function
 
Public Function reallocMem(ByVal lptr As Long, ByVal lSize As Long) As Long
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  Retorna la Dirrecion de un SafeArray que se retorno en allocMem()/reallocMem().
Dim pBuff()     As Byte
    putDWord VarPtrArr(pBuff), lptr
    If Not (lSize = &H0) Then
        ReDim Preserve pBuff(0 To (lSize - 1))
    Else
        Erase pBuff
    End If
    reallocMem = getDWord(VarPtrArr(pBuff))
    putDWord VarPtrArr(pBuff), 0
End Function
 
Public Function getMemData(ByVal lptr As Long) As Long
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  lPtr debe ser el valor (Address) que retorno en allocMem()/reallocMem().
'   //  Esta funcion retorna la Dirrecion de memoria EDITABLE de lPtr (Dirrecion de un SafeArray).
'   //  Referencias.
'   //  http://msdn.microsoft.com/en-us/library/aa908603.aspx
    If (lptr = &H0) Then Exit Function
    getMemData = getDWord(lptr + &HC)    '   //  obtenemos pvData
End Function
 
Public Sub releaseMem(ByVal lptr As Long)
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  lPtr debe ser la Dirrecion que retorno en allocMem()/reallocMem().
Dim pBuff()     As Byte
    putDWord VarPtrArr(pBuff), lptr
End Sub
 
Public Sub releaseMemStr(ByVal lptr As Long)
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  lPtr debe ser la Dirrecion que retorno en cloneString().
Dim sStr        As String
    putDWord VarPtr(sStr), lptr
End Sub
 
Public Sub swapVarPtr(ByVal lpVar1 As Long, ByVal lpVar2 As Long)
'   //  By BlackZeroX (Thanks to Karcrack).
Dim lAux    As Long
    lAux = getDWord(lpVar1)
    Call putDWord(lpVar1, getDWord(lpVar2))
    Call putDWord(lpVar2, lAux)
End Sub
 
Public Function cloneString(ByVal lpStrDst As Long, ByVal sStrSrc As String) As Long
'   //  By BlackZeroX (Thanks to Karcrack).
'   //  lPtr -> Puntero a una variable destino (Preferiblemente String).
'   //  sStr -> Cadena Clonada ( gracias a Byval ).
Dim lpStrSrc        As Long
    If Not (lpStrDst = &H0) And (mMemoryEx.initialize = True) Then
        Call mMemoryEx.swapVarPtr(lpStrDst, VarPtr(sStrSrc))
        Call mMemoryEx.swapVarPtr(VarPtr(cloneString), VarPtr(sStrSrc))
    End If
End Function
 
Public Function copyMemory(ByVal lpDst As Long, ByVal lpSrc As Long, ByVal lLn As Long) As Long
'   //  By BlackZeroX (Thanks to Karcrack).
Dim i       As Long
    If (lpSrc = &H0) Or (lpDst = &H0) Or (lLn = &H0) Then Exit Function
   
    i = (lLn Mod 4)
    If ((i And &H2) = &H2) Then
        Call putWord(lpDst, getWord(lpSrc))
        lpDst = (lpDst + 2)
        lpSrc = (lpSrc + 2)
        copyMemory = (copyMemory + 2)
        lLn = (lLn - 2)
    End If
    If ((i And &H1) = &H1) Then
        Call putByte(lpDst, getByte(lpSrc))
        lpDst = (lpDst + 1)
        lpSrc = (lpSrc + 1)
        copyMemory = (copyMemory + 1)
        lLn = (lLn - 1)
    End If
    For i = 0 To (lLn - 1) Step 4
        Call putDWord(lpDst + i, getDWord(lpSrc + i))
    Next
    copyMemory = (copyMemory + lLn)
   
End Function

Dulces Lunas!¡.