(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

$spider = New-Object Chilkat.Spider

# 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 = 0; $i -le 9; $i++) {

    $success = $spider.CrawlNext()
    if ($success -eq $true) {
        # Show the URL of the page just spidered.
        $($spider.LastUrl)
        # The HTML is available in the LastHtml property
    }
    else {
        # Did we get an error or are there no more URLs to crawl?
        if ($spider.NumUnspidered -eq 0) {
            $("No more URLs to spider")
        }
        else {
            $($spider.LastErrorText)
        }

    }

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