如何改写 apache 的规则成 nginx

RewriteEngine on
RewriteCond %{http_host} ^a.com [NC]
RewriteRule ^(.*)$ http://www.a.com$1 [R=301,L]

RewriteRule ^/redirect/(.*)$ /index/data/redirect.php?param=$1 [L]

RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteRule ^/((?!.).)*(?<!/)$ $0/ [R=301,L]

RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{REQUEST_URI} !^/(public|admin)/{0,1}
RewriteRule ^/ /index.php [L]

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