Rails - Sep 2007 - gsub question, not a regex question...including part of the original in the sub...

Hi all,

I''ve got a simple bulletin board type of code in part of my
application, and I want to implement phpbb-like tags for users to add
to posts.  I strip HTML out of the posts, of course.  I can handle
things like [b] => <b> with a simple gsub, but there''s one
that is
throwing me for a loop.  I want users to be able to quote other users,
and have the quoted text show up with an "originally posted by
username" and some CSS code.  I can gsub the [/QUOTE] into a </div>
but how do I change [QUOTE=username] into:

 <div class="quote"><p><em>Originally posted by
username</em></p>

Yes, I can do most of it with a gsub, but how do I pull "username" out
of the original text and put it where it belongs in the substituted
text?

Or is there a better way to do this all together?

Thanks!


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andrew.ohnstad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
> Hi all,
> 
> I''ve got a simple bulletin board type of code in part of my
> application, and I want to implement phpbb-like tags for users to add
> to posts.  I strip HTML out of the posts, of course.  I can handle
> things like [b] => <b> with a simple gsub, but there''s
one that is
> throwing me for a loop.  I want users to be able to quote other users,
> and have the quoted text show up with an "originally posted by
> username" and some CSS code.  I can gsub the [/QUOTE] into a
</div>
> but how do I change [QUOTE=username] into:
> 
>  <div class="quote"><p><em>Originally posted by
username</em></p>
> 
> Yes, I can do most of it with a gsub, but how do I pull
"username" out
> of the original text and put it where it belongs in the substituted
> text?
Shortened to not wrap:

"[q=u]".gsub(/\[q=(\w+)\]/, ''<div
class="q">blah \1</div>'')

=> "<div class=\"q\">blah u</div>"

( ) are used for grouping in regexes and \1, \2, etc. are used to 
reference the groups in the replacement pattern.

So (\w+) creates a group of all the "word" characters after the q= and
before the ] and puts that into \1.


-- 
Michael Wang

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