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Wildcard Subdomains to file nginx rewrites - 14 years ago

We have just transferred over to Nginx, and so far we love the stability, and the speed it offers over Apache. However, with Apache we had the ability to have "username.domain,com" setup in our re-writes, which pointed to "file.php?id=username", however I cannot figure out a way to do this similar in nginx. Could someone help us out. Cheers, Jacob