From: Daniel N <has.sox@...>
Date: 2007-07-13T17:12:57+09:00
Subject: Re: Regexp Question - Merb::Router

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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.

Cheers
Daniel

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