This tutorial shows the result of testing I did of a regular expression (regex) that I found in the following stackoverflow.com question https://stackoverflow.com/questions/2370015/regular-expression-for-password-validation
The user asked for a regular expression for validating a password with the following condition: "Password must contain 8 characters and at least one number, one letter and one unique character such as !#$%&? "
The proposed regex (which will only work with the Latin alphabet) is