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I suppose this shall help
http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm

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On Mon, Jun 14, 2010 at 8:54 PM, Abder-rahman Ali <
abder.rahman.ali / gmail.com> wrote:

> I'm new to Ruby, and just want to ask about how to read the following
> statement from the "Agile Web Development With Rails, 3rd edition" book:
>
> %r{\.(gif|jpg|png)$}i
>
> I knew that %r is a way to write a regular expression.
>
> But, what is the $, and the i?
>
> Thanks.
> --
> Posted via http://www.ruby-forum.com/.
>
>

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