(Ruby) 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".

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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