How to use Nginx Regexp in the location
<p>The web project have static content into the some /content/img folder.
The url rule is: /img/{some md5} 
but location in the folder: /content/img/{The first two digits}/ </p>

<p>Example </p>

<pre><code>url:      example.com/img/fe5afe0482195afff9390692a6cc23e1
location: /www/myproject/content/img/fe/fe5afe0482195afff9390692a6cc23e1
</code></pre>

<p>This nginx location is correct but lot not security (the symbol point is not good in regexp):</p>

<pre><code>        location ~ /img/(..)(.+)$ {
               alias $project_home/content/img/$1/$1$2;
               add_header Content-Type image/jpg;
         }
</code></pre>

<p>The next location is more correct, but not work:</p>

<pre><code>        location ~ /img/([0-9a-f]\{2\})([0-9a-f]+)$ {
               alias $project_home/content/img/$1/$1$2;
               add_header Content-Type image/jpg;
         }
</code></pre>

<p>Help me find error for more correct nginx location.</p>