Apache is still by far the most widely deployed HTTP server, according to the latest Netcraft web server survey, but nginx has been slowly, steadily gaining market share, thanks to its blazing speed. If you want to try a faster web server and move from Apache to nginx, you'll probably have to change some of your websites' configurations, starting with rewrite directives. To migrate rewrite rules from Apache to nginx, start with these tips and tricks.
The Apache mod_rewrite module provides powerful and sophisticated tools for nearly all types of URL rewriting. It is, however, somewhat complex, and may be intimidating to beginners. In fact, however, rewrite rules are not magical incantations, though to understand them you need some understanding of regular expressions.