Match iframe partial class to an string of codes

So I'm not too sure on how to properly execute this, so I wanted to ask the community.

I know about matching an array of things, but how would I be able to do the following:

I have these two outputs:

console.log(target[0].className);
console.log(window.OnetrustActiveGroups);

This outputs me:

enter image description here

What would be the best way to determine if target[0].className with is optanon-category-C0003 has a match inside window.OnetrustActiveGroups?

All help is appreciated!

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