Is DESelect case sensitive?

Case sensitivity defines whether uppercase and lowercase characters are treated as distinct or equivalent.

DESelect, like Salesforce Marketing Cloud, is not case-sensitive in the filter values used inside a Selection, and therefore does not differentiate between uppercase and lowercase characters.

For example, the words 'Value' and 'VALUE' would be treated as equals.

However, DESelect is case-sensitive when it comes to the names of the Selections or folders created in it: you could have two Selections/folders named "test" and "TEST" and they'd be treated as different Selections/folders.