How to extract URLs from text

Question

How do I extract all URLs from a plain text file in Ruby?

I tried some libraries but they fail in some cases. What\'s the best way?

Answer 1

I've used twitter-text gem

require "twitter-text"
class UrlParser
    include Twitter::Extractor
end

urls = UrlParser.new.extract_urls("http://stackoverflow.com")
puts urls.inspect