subdomain server_name help

[rkmr.em at gmail.com]

i want to send all requests with a subdomain that contains a particular
string to be sent to a particular backend.

for ex analyzerAA.XX.com and BBanalyzer.XX.com should be selected.

what is the correct way of writing this configuration?
thanks a lot



    server {
        server_name  analyzer.XX.com;
        location / {
            fastcgi_pass backend_analyzer;
        }
    }
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