Код:

#include <Array.au3>
Global $string = "абвгд"
Dim $ar1[5], $ar2[5]
$ar1[0]= "а"
$ar1[1]= "б"
$ar1[2]= "в"
$ar1[3]= "г"
$ar1[4]= "д"
$ar2[0]= "1"
$ar2[1]= "2"
$ar2[2]= "3"
$ar2[3]= "4"
$ar2[4]= "5"
$iSL = StringLen($string)
For $i = 1 To $iSL
$sSimbol = StringMid($string, $i, 1)
For $l = 0 To UBound($ar1) - 1
If $sSimbol = $ar1[$l] Then
$ar1[$l] = $ar2[$l]
;~ ExitLoop
EndIf
Next
Next
_ArrayDisplay($ar1)