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Sorry, I am not sure I understand your requirement here. Is it that you want to match a request with a header of

apiKey: [t,e,s,t]

Yup, exactly. I'll have a key with value "test".toCharArray(), so it should match ["t","e","s","t"] the only idea I have come up with would be to use matcher like "value": { "matches": "^(.*[\"t\",\"e\",\"s\",\"t\"]])" } but it looks like a workaround. Or would it be proper solution?

Out of interest, what problem are you trying to solve here?