Hi Venky-Rams
Is "OpenIDConnect.nounce.A1234awds" the cookie name or value that is dynamic?
If the VALUE is dynamic you can retrieve this by using the context variable: ${request.http.cookievalues.<name>}
If the NAME is dynamic you may be able to use some regex along these lines. This will match any 9 characters after the nounce value.
OpenIDConnect.nounce.[a-zA-Z0-9]{9}
Regards,
Joe