> Bird brain me :-)
>
> What does this mean?
>
> ~SESS[[:alnum:]]+=(?<session_id>[[:graph:]]+) $session_id;

It means to grab the sub-token on the right-hand side of the session token.
Using POSIX character classes for the regex:

https://en.wikipedia.org/wiki/Regular_expression#POSIX_character_classes

> Also 'if' is evil inside a location. Right ?

Not really. Here it's a mere return. From the famous IfIsEvil wiki page:

The only 100% safe things which may be done inside
if in location context are:

return ...;
rewrite ... last;
--appa

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