From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2011-02-19T00:49:53+09:00
Subject: Re: Help for extracting text with regexp.

On Fri, Feb 18, 2011 at 4:02 PM, John Doe <netiqicufenihyse@tempomail.fr> wrote:
> Hi,
>
> I'm having some trouble with the regexp :/
>
> I'm messing up with the match, scan methods, I'm not sure wich one I
> should use.
>
> Here's what I'm trying to do :
>
> I have a string that's an URL with get values :
> Ex :
> foo.bar/somePath/somepage.php?attr=value&theone=64646hs554&other=ddd
>
> What I need is the value of the "theone" attribute.
> This attribute may or may not be the last one in the string !
>
> I don't know if it's possible to put the two cases in one regexp...
>
> Here are my two regexp :
>
> If it's not the last attribute
> /session=(.*?)&/
> If it's the last attribute
> /session=(.*?)$/
>
> What should I use next to extract the value ? scan or match ?
>
> myString.scan(/session=(.*?)&/) ?
> How can I handle the two situation ?
>
> Thanks a lot for your help !
>
> (Sorry for my english)

URI and CGI from the standard library will do the work for you:

irb(main):001:0> require 'uri'
=> true
irb(main):002:0> require 'cgi'
=> true
irb(main):004:0> params =
CGI.parse(URI.parse("foo.bar/somePath/somepage.php?attr=value&theone=64646hs554&other=ddd").query)
=> {"other"=>["ddd"], "theone"=>["64646hs554"], "attr"=>["value"]}
irb(main):005:0> params["theone"]
=> ["64646hs554"]
irb(main):006:0> params["theone"].first
=> "64646hs554"


Jesus.