Avoid URLs Matching Any of a Set of Patterns

Demonstrates how to use "avoid patterns" to prevent spidering any URL that matches a wildcarded pattern. This example avoids URLs containing the substrings "java", "python", or "perl".

Download Chilkat Ruby Library

require 'chilkat'

#  The Chilkat Spider component/library is free.
spider = Chilkat::CkSpider.new()

#  The spider object crawls a single web site at a time.  As you'll see
#  in later examples, you can collect outbound links and use them to
#  crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com
spider.Initialize("www.chilkatsoft.com")

#  Add the 1st URL:
spider.AddUnspidered("http://www.chilkatsoft.com/")

#  Avoid URLs matching these patterns:
spider.AddAvoidPattern("*java*")
spider.AddAvoidPattern("*python*")
spider.AddAvoidPattern("*perl*")

#  Begin crawling the site by calling CrawlNext repeatedly.

for i in 0 .. 9

    success = spider.CrawlNext()
    if (success == true)
        #  Show the URL of the page just spidered.
        print spider.lastUrl() + "\n";
        #  The HTML is available in the LastHtml property
    else
        #  Did we get an error or are there no more URLs to crawl?
        if (spider.get_NumUnspidered() == 0)
            print "No more URLs to spider" + "\n"
        else
            print spider.lastErrorText() + "\n"
        end

    end

    #  Sleep 1 second before spidering the next URL.
    spider.SleepMs(1000)
end