Is it possible to have a regex in the replacement string of a rewrite rule in nginx

Question

I need a quite special rewrite rule but I can’t find the way to do it.

I need to map a uri to a regex to a replacement string built with a regex.

For example I have a /pdv/plan-AGE44-ABC.pdf uri that could be mapped to the following ones :

• /files/AGE44/plan-ABC.pdf
• /files/AGE44/plan-ABC(version-1).pdf
• /files/AGE44/plan-ABC(version-2).pdf
• /files/AGE44/plan-ABC(version-3).pdf

So the (version-1) part in the replacement string is optional so I thought about using a regex here.

An example of my rule :

location /pdv/ { rewrite ^/pdv/plan-(.*)-(.*).pdf$ "/files/$1/plan-$2.pdf" last; return 404; } 

This supports the first case (/files/AGE44/plan-ABC.pdf) but I can't find the way to support the other ones.

Any idea how I could do this ?