Rejecting info from being stored in a file - ruby

Question

I have a working program that searches Google using Mechanize, however when the program searches Google it also pulls sites that look something like http://webcache.googleusercontent.com/.
I would like to reject that site from being stored in the file. All the sites' URLs are structured differently.
Source code:
require 'mechanize'
PATH = Dir.pwd
SEARCH = "test"
def info(input)
puts "[INFO]#{input}"
end
def get_urls
info("Searching for sites.")
agent = Mechanize.new
page = agent.get('http://www.google.com/')
google_form = page.form('f')
google_form.q = "#{SEARCH}"
url = agent.submit(google_form, google_form.buttons.first)
url.links.each do |link|
if link.href.to_s =~ /url.q/
str = link.href.to_s
str_list = str.split(%r{=|&})
urls_to_log = str_list[1]
success("Site found: #{urls_to_log}")
File.open("#{PATH}/temp/sites.txt", "a+") {|s| s.puts("#{urls_to_log}")}
end
end
info("Sites dumped into #{PATH}/temp/sites.txt")
end
get_urls
Text file:
http://www.speedtest.net/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:M47_v0xF3m8J
http://www.speedtest.net/%252Btest%26gbv%3D1%26%26ct%3Dclnk
http://www.speedtest.net/results.php
http://www.speedtest.net/mobile/
http://www.speedtest.net/about.php
https://support.speedtest.net/
https://en.wikipedia.org/wiki/Test
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:R94CAo00wOYJ
https://en.wikipedia.org/wiki/Test%252Btest%26gbv%3D1%26%26ct%3Dclnk
https://www.test.com/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:S92tylTr1V8J
https://www.test.com/%252Btest%26gbv%3D1%26%26ct%3Dclnk
https://www.speakeasy.net/speedtest/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:sCEGhiP0qxEJ:https://www.speakeasy.net/speedtest/%252Btest%26gbv%3D1%26%26ct%3Dclnk
https://www.google.com/webmasters/tools/mobile-friendly/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:WBvZnqZfQukJ:https://www.google.com/webmasters/tools/mobile-friendly/%252Btest%26gbv%3D1%26%26ct%3Dclnk
http://www.humanmetrics.com/cgi-win/jtypes2.asp
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:w_lAt3mgXcoJ:http://www.humanmetrics.com/cgi-win/jtypes2.asp%252Btest%26gbv%3D1%26%26ct%3Dclnk
http://speedtest.xfinity.com/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:snNGJxOQROIJ:http://speedtest.xfinity.com/%252Btest%26gbv%3D1%26%26ct%3Dclnk
https://www.act.org/content/act/en/products-and-services/the-act/taking-the-test.html
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:1sMSoJBXydo
https://www.act.org/content/act/en/products-and-services/the-act/taking-the-test.html%252Btest%26gbv%3D1%26%26ct%3Dclnk
https://www.16personalities.com/free-personality-test
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:SQzntHUEffkJ
https://www.16personalities.com/free-personality-test%252Btest%26gbv%3D%26%26ct%3Dclnk
https://www.xamarin.com/test-cloud
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:ypEu7XAFM8QJ:
https://www.xamarin.com/test-cloud%252Btest%26gbv%3D1%26%26ct%3Dclnk

Answer 1

It works now. I had issue with success('log'), i dont know why but commented it.
str_list = str.split(%r{=|&})
next if str_list[1].split('/')[2] == "webcache.googleusercontent.com"
# success("Site found: #{urls_to_log}")
File.open("#{PATH}/temp/sites.txt", "a+") {|s| s.puts("#{urls_to_log}")}

Answer 2

There are well-tested wheels used to tear apart URLs into the component parts so use them. Ruby comes with URI, which allows us to easily extract the host, path or query:
require 'uri'
URL = 'http://foo.com/a/b/c?d=1'
URI.parse(URL).host
# => "foo.com"
URI.parse(URL).path
# => "/a/b/c"
URI.parse(URL).query
# => "d=1"
Ruby's Enumerable module includes reject and select which make it easy to loop over an array or enumerable object and reject or select elements from it:
(1..3).select{ |i| i.even? } # => [2]
(1..3).reject{ |i| i.even? } # => [1, 3]
Using all that you could check the host of a URL for sub-strings and reject any you don't want:
require 'uri'
%w[
http://www.speedtest.net/
http://webcache.googleusercontent.com/search%3Fhl%3Den%26biw%26bih%26q%3Dcache:M47_v0xF3m8J
].reject{ |url| URI.parse(url).host[/googleusercontent\.com$/] }
# => ["http://www.speedtest.net/"]
Using these methods and techniques you can reject or select from an input file, or just peek into single URLs and choose to ignore or honor them.