Función Replace
Sustituye una cadena por otra.
Replace (Text As String, SearchStr As String, ReplStr As String [, Start As Long [, Count as long [, Compare As Boolean]]]
Cadena
Texto: cualquier expresión de cadena que se quiera modificar.
SearchStr: Any string expression that shall be searched for.
ReplStr: Any string expression that shall replace the found search string.
Start: Numeric expression that indicates the character position within the string where the search shall begin. The maximum allowed value is 65535.
Count: The maximal number of times the replace shall be performed.
Compare: Optional boolean expression that defines the type of comparison. The value of this parameter can be TRUE or FALSE. The default value of TRUE specifies a text comparison that is not case-sensitive. The value of FALSE specifies a binary comparison that is case-sensitive. You can as well use 0 instead of FALSE or 1 instead of TRUE.
msgbox replace ("aBbcnnbnn", "b", "$", 1, 1, FALSE)'returns "aB$cnnbnn"
REM significado: «b» debería sustituirse, pero
REM * nada más en minúscula (parámetro 6), por consiguiente la 2.ª ocurrencia de «b»
REM * solo la primera ocurrencia (que respeta mayusculación) (parámetro 5)