From: Daniel N <has.sox@...>
Date: 2007-07-13T17:33:17+09:00
Subject: Re: Regexp Question - Merb::Router

------=_Part_25032_3629372.1184315598695
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

On 7/13/07, Robert Klemme <shortcutter@googlemail.com> wrote:
>
> 2007/7/13, Daniel N <has.sox@gmail.com>:
> > On 7/13/07, Robert Klemme <shortcutter@googlemail.com> wrote:
> > >
> > > 2007/7/13, Daniel N <has.sox@gmail.com>:
> > > > Hi,
> > > >
> > > > I'm looking through the Merb::Routing code and I've found a regexp
> that
> > > I
> > > > can't figure out how it works.
> > > >
> > > > Merb::Router::SECTION_REGEXP  #=> /(?::([a-z*_]+))/
> > > >
> > > > It takes a route definition string, like "/products/:model/:id"  and
> > > > extracts the "model" string on the first pass, and later  the "id"
> > > string.
> > > >
> > > > Can anyone shed some light on what the
> > > > ?::
> > > > part does?  I haven't found it in any of the documentation for Ruby
> > > Regexps
> > > > that I've found.
> > >
> > > It's actually *two* parts: (?:) is a non capturing regexp group.  The
> > > second ":" literally matches a single colon.
> > >
> > > Kind regards
> > >
> > > robert
> > >
> > > Thanx Robert,
> >
> > I've not heard of that before.  Makes searching on google much easier :)
> >
> > /(?::([a-z*_]+))/
> >
> > I guess this means that a nested group within this non capturing group
> (this
> > case) is captured though since the $1 variable is refered to later.
>
> Exactly.  Btw, in your case I'd probably use another regexp. Some samples:
>
> irb(main):001:0> "/products/:model/:id".scan %r{/:([^/]+)}
> => [["model"], ["id"]]
> irb(main):002:0> "/products/:model/:id".scan %r{:([^/]+)}
> => [["model"], ["id"]]
> irb(main):004:0> "/products/:model/:id".scan %r{:[^/:]+}
> => [":model", ":id"]
>
> But of course I do not know the full spec of your input data.
>
> Kind regards
>
> robert
>

I'm just trying to understand that regexp's place in the Merb routing code
at the moment.

You've cleared it up nicely for me.

Thankyou
Daniel

------=_Part_25032_3629372.1184315598695--