Same regex caching

[David Yu]

On Thu, Jul 21, 2011 at 10:43 PM, Igor Sysoev <igor at sysoev.ru> wrote:

> On Thu, Jul 21, 2011 at 10:18:06PM +0800, David Yu wrote:
> > Hi,
> >
> > I wanted to ask if the same regex used in multiple conditions is the same
> > cached-compiled version?
> > Eg I need to validate the all the (sub)request params before sending it
> > upstream:
> >
> > location /foo {
> >
> > if ($time !~ /(\d\d):(\d\d):(\d\d)/) { return 400; }
> > if ($arg_time !~ /(\d\d):(\d\d):(\d\d)/) { return 400; }
> >
> > }
> >
> > #note that in the real app, I'll have lots of repeated regex for email,
> > phone, used in every if directive
> >
> > location /bar {
> >
> > if ($arg_time !~ /(\d\d):(\d\d):(\d\d)/) { return 400; }
> > set_form_input $form_time time_finished;
> > if ($form_time !~ /(\d\d):(\d\d):(\d\d)/) { return 400; }
> >
> > }
> >
> > What I'm trying to do is send the params to redis with its lua scripting
> > engine handling the *pre-validated* request.
> > Redis is single-process while nginx can have multiple workers ... so its
> > only fitting to let nginx do validation for redis :-)
>
> No, each regex is compiled separately.
>
Thanks for the quick reply.
I'm thinking maybe the nginx map can act as the regex cache for the same
ones.

set $map_regex_time $arg_time
if ( !$map_regex_time) return { 400; }

set_form_input $map_regex_time time_finished;
if (! $map_regex_time) return { 400; }

Since I'll literally have hundreds of fields using the same regex, this
might help?


>
> --
> Igor Sysoev
>
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-- 
When the cat is away, the mouse is alone.
- David Yu
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