From: Lars Haugseth <njus@...>
Date: 2010-05-31T18:25:07+09:00
Subject: Re: Validation for feed links using by 'rss'

* saurabh purnaye <saurabh.purnaye@gmail.com> wrote:
> 
> [Note:  parts of this message were removed to make it a legal post.]
>
> Hi,
> There are ways to validate url
>
> 1. validate using reg ex
>
>  /(^$)|(^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$)/ix

Why not use the standard library?

require 'uri'

begin
  uri = URI.parse(url_string)
rescue URI::InvalidURIError
  puts "Bad URL: #{url_string}"
end

-- 
Lars Haugseth