Hi @Fernando_Lopez,
one possible Workaround would be to encode the letters into Numbers like: SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE("ABab","A","0"),"B","1"),"a","26"),"b","27")
The letters “ABab” would give 012627.
The letters “AbaB” would give 027261.
The compare result will be FALSE.
For sure - you will have a very long expression, because you have to SUBSTITUTE() every letter. For example: A-Z substitute with 0-25 and a-z substitute with 26-51.
Instead of “ABab” you can put your column name [Texto1] and in the compare expression [Texto2].