From: Todd Benson <caduceass@...>
Date: 2008-04-05T17:41:39+09:00
Subject: Re: [regexp] How to extract...

On Fri, Apr 4, 2008 at 8:00 PM, 7stud -- <bbxx789_05ss@yahoo.com> wrote:
>
> Jan Kowalski wrote:
>  > From:
>  >
>  > #header h1 a {
>  >   display: block;
>  >   background: url(images/wordpress-logo.png) center left no-repeat;
>  >   width: 301px;
>  >   height: 88px;
>  >   text-indent: -9999px;
>  >   float: left;
>  > }
>  >
>  > #header ul li#download a {
>  >   background: #d54e21 url(images/download-tab-bg.png) bottom left
>  > repeat-x;
>  >   color: #fff;
>  >   -moz-border-radius-topleft: 3px;
>  >   -khtml-border-top-left-radius: 3px;
>  >   -webkit-border-top-left-radius: 3px;
>  >   border-top-left-radius: 3px;
>  >   -moz-border-radius-topright: 3px;
>  >   -khtml-border-top-right-radius: 3px;
>  >   -webkit-border-top-right-radius: 3px;
>  >   border-top-right-radius: 3px;
>  >   text-shadow: #b5421c 1px 1px 1px;
>  > }
>  >
>  > i need each occurence of text enclosed between url(************), for
>  > this example:
>  >
>  > images/wordpress-logo.png
>  > images/download-tab-bg.png
>
>  str = <<CSS
>
> #header h1 a {
>   display: block;
>   background: url(images/wordpress-logo.png) center left no-repeat;
>   width: 301px;
>   height: 88px;
>   text-indent: -9999px;
>   float: left;
>  }
>
>  #header ul li#download a {
>   background: #d54e21 url(images/download-tab-bg.png) bottom left
>  repeat-x;
>   color: #fff;
>   -moz-border-radius-topleft: 3px;
>   -khtml-border-top-left-radius: 3px;
>   -webkit-border-top-left-radius: 3px;
>   border-top-left-radius: 3px;
>   -moz-border-radius-topright: 3px;
>   -khtml-border-top-right-radius: 3px;
>   -webkit-border-top-right-radius: 3px;
>   border-top-right-radius: 3px;
>   text-shadow: #b5421c 1px 1px 1px;
>  }
>  CSS
>
>  pattern = /url\((.*)\)/ #to match a parenthesis escape it with a '\'
>
>  str.each do |line|
>   match = line[pattern, 1]  #1 is the parenthesized sub pattern
>   if match
>     puts match
>   end
>  end
>
>  --output:--
>
>
> images/wordpress-logo.png
>  images/download-tab-bg.png

You can use a non-greedy multi-line #scan pattern as well...

str.scan /url\((.*?)\)/m
=> [["images/wordpress-logo.png"], [images/download-tab-bg.png]]

...which you can #flatten if you want.

Todd