On Fri, Aug 26, 2011 at 12:47:55PM +0100, Dick Middleton wrote:
> Hi,
>
> In the wiki for the map module (http://wiki.nginx.org/HttpMapModule) the
> following is given as an example:
>
> map $uri $myvalue {
> /aa /mapped_aa;
> ~^/aa/(?<suffix>.*)$ /mapped_bb/$suffix;
> }
>
>
> The second form, the regex, I can't get to work - it returns the literal text
> rather than substituting for $suffix.
>
> from my map block:
>
> map $uri $locn {
> ~^/pdns(?<suffix>.*)$ /var/www/pdns$suffix;
> }
>
> the I rewrite:
>
> rewrite ^ $locn;
>
> from the log:
>
> open() "/var/www/pdns$suffix" failed
>
> How do I get this to substitute?
>
> This is using nginx/1.1.0 on debian squeeze.

Wiki is wrong here. Currently nginx does not support expression
in value part, you may use only a single variable, i.e.:
~^/pdns(?<suffix>.*)$ $suffix;

However, this wiki example is very ineffectual, because it maps $uri to path
forcing to use "rewrite". There are other simple ways to this, for example:

location /pdns {
root /var/www;
}

or (wiki expample):

location = /aa {
alias /mapped_aa;
}

location /aa/ {
alias /mapped_bb/;
}


--
Igor Sysoev

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