Querying if a Repeater contains a value

How do I find out if a repeater contains an instance of a specific text string?

My problem is that I need to see if a repeater contains a line for (e.g.) “Cars”, and if it does not, then perform an Add to create a new row for “Cars”.

seach “listener “ in this form.

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Right - and ended up with some of my own posts. It seems I used to be quite expert on this kind of thing but having not used Axure in anger for a long time, the knowledge just seeped from my mind…

Thanks for the spot…