Hi,

I was recently reading the PHPfastcgi example at http://wiki.nginx.org/PHPFcgiExample. When it talks about the configuration to avoid the exploit on uploads folder, there is a regulare expresion saying: location ~* (^(?!(?:(?!(php|inc)).)*/blogs\.dir/).*?(php|inc)) {

I don't understand that regular expresion. Could someone explain me what ?! ?: mean or send me some link to documentation about this?? I cannot find anything after some googling.

Thanks and regards.