Merb devel - Jul 2007 - Regexp Question - Merb::Router

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.

Cheers
Daniel
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?: is used inside parentheses to indicate that they shouldn''t be used  
as a match group.  The second colon is used here as a literal.


On Jul 13, 2007, at 2:22 AM, Daniel N wrote:
> 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.
>
> Cheers
> Daniel
>
> _______________________________________________
> Merb-devel mailing list
> Merb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/merb-devel