Avoid URLs Matching Any of a Set of Patterns

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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".

'  The Chilkat Spider component/library is free.
Dim spider As New 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.
Dim i As Long
For i = 0 To 9
    Dim success As Boolean
    success = spider.CrawlNext()
    If (success = true) Then
        '  Show the URL of the page just spidered.
        TextBox1.Text = TextBox1.Text & spider.LastUrl & vbCrLf
        '  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 = 0) Then
            MsgBox("No more URLs to spider")
        Else
            MsgBox(spider.LastErrorText)
        End If

    End If

    '  Sleep 1 second before spidering the next URL.
    spider.SleepMs(1000)
Next