How do I check duplicate tokens in a string?

What are you going to do if there is the more important question.

I write this return value in an array for further processing where I check for each token and draw a tile in tilemap.

Then I would suggest putting all the strings in an array first and using "contains value" for each possibility.

I ended up doing it like this:

Problem with arrays is that all the rows/columns etc need to be the same length, which makes it harder to count values etc. Next problem is that it is just cumbersome to make in C3, as it is separate object, needs either duplicate or some ID to reference it, but ideally it could act as variables/strings do, so that temporary arrays could be created locally. No dimensions besides 3 either.

Dictionary object may be another way to go, or the Table plugin, which is across between dictionary and array objects.

https://www.construct.net/en/forum/extending-construct-2/addons-29/plugin-table-2d-dictionary-93675