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Use (?i) to match case-insensitively
eg: rewrite (?i)/(Cheap-[^\/]+\.html)(.*)$ /filter.php?route=$1 last;
参考：http://stackoverflow.com/questions/21577841/nginx-case-insensitive-url-redirection
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原文地址：http://www.cnblogs.com/archoncap/p/4877125.html
