Xbase++
Must-Match Patterns

You may restrict the spider to only follow links that match any one of a set of "must-match" wildcard patterns. The AddMustMatchPattern can be called repeatedly to add must-match patterns.
Chilkat Xbase++ Downloads

Download Chilkat for Xbase++
Xbase++
LOCAL nSuccess
LOCAL oSpider
LOCAL i
LOCAL cUrl

nSuccess := 0

oSpider := CreateObject("Chilkat.Spider")

//  --------------------------------------------------------------------
//  Note: The URLs in this example are no longer valid.
//  You should replace the URLs with URLs from a site of your
//  own choosing -- preferably your own site if testing.
//  (Google's Directory no longer exists.)
//  --------------------------------------------------------------------

//  First, we'll get the outbound links for a page in the
//  Google directory.  Then we'll add some must-match
//  and then re-fetch, to see it work...

oSpider:Initialize("directory.google.com")
oSpider:AddUnspidered("http://directory.google.com/Top/Recreation/Outdoors/Hiking/Backpacking/")

nSuccess := oSpider:CrawlNext()

//  Display the outbound links

FOR i := 0 TO oSpider:NumOutboundLinks - 1
    ? oSpider:GetOutboundLink(i)
NEXT

//  The output:
//  http://www.backpacker.com
//  http://www.cmc.org
//  http://www.backpacking.net
//  http://www.thebackpacker.com/
//  http://www.rei.com/online/store/LearnShareArticlesList?categoryId=Camping
//  http://www.trailspace.com/
//  http://www.catskillhikes.com/
//  http://gorp.away.com/gorp/location/asia/nepal/favpicks.htm
//  http://www.backpackinglight.com/cgi-bin/backpackinglight/index.html
//  http://www.yetizone.com/
//  http://www.backpackingfun.com
//  http://www.freezerbagcooking.com/
//  http://www.spadout.com/backpacking/
//  http://sierrabackpacker.com
//  http://www.abovecalifornia.com/
//  http://www.personal.psu.edu/faculty/r/p/rpc1/bbb/
//  http://www.thebackpackersguide.com
//  http://www.journeywest.com/WB/index.html
//  http://www.johann-sandra.com/backpackdir.htm
//  http://www.geocities.com/amytys/
//  http://www.cloudwalkersbasecamp.com
//  http://www.netbackpacking.com
//  http://members.tripod.com/~stooges/
//  http://www.thebackpackingsite.com
//  http://www.thruhikers.com/
//  http://www.redcompservices.com/AT/
//  http://members.aol.com/CMorHiker/backpack
//  http://mywebpages.comcast.net/midwestpacker/
//  http://www.midwesthiker.com/
//  http://www.WeBackpack.com
//  http://www.michiganhiker.com
//  http://www.host33.com/backpack/
//  http://www.wilderness-backpacking.com
//  http://www.thetravelmonkey.net
//  http://dmoz.org/cgi-bin/add.cgi?where=Recreation/Outdoors/Hiking/Backpacking
//  http://dmoz.org/about.html
//  http://dmoz.org/cgi-bin/apply.cgi?where=Recreation/Outdoors/Hiking/Backpacking
//  http://dmoz.org
//  http://dmoz.org/profiles/cdog.html
//  http://dmoz.org/profiles/justinwp.html

//  Do it again, but this time with avoid patterns.
oSpider:Initialize("directory.google.com")
oSpider:AddUnspidered("http://directory.google.com/Top/Recreation/Outdoors/Hiking/Backpacking/")

//  Add some must-match patterns:
oSpider:AddMustMatchPattern("*.com/*")
oSpider:AddMustMatchPattern("*.net/*")

//  Add some avoid-patterns:
oSpider:AddAvoidOutboundLinkPattern("*.mypages.*")
oSpider:AddAvoidOutboundLinkPattern("*.personal.*")
oSpider:AddAvoidOutboundLinkPattern("*.comcast.*")
oSpider:AddAvoidOutboundLinkPattern("*.aol.*")
oSpider:AddAvoidOutboundLinkPattern("*~*")

nSuccess := oSpider:CrawlNext()

? "-----------------------"

//  Display the outbound links
FOR i := 0 TO oSpider:NumOutboundLinks - 1
    ? oSpider:GetOutboundLink(i)
NEXT

//  Output:
//  http://www.thebackpacker.com/
//  http://www.rei.com/online/store/LearnShareArticlesList?categoryId=Camping
//  http://www.trailspace.com/
//  http://www.catskillhikes.com/
//  http://gorp.away.com/gorp/location/asia/nepal/favpicks.htm
//  http://www.backpackinglight.com/cgi-bin/backpackinglight/index.html
//  http://www.yetizone.com/
//  http://www.freezerbagcooking.com/
//  http://www.spadout.com/backpacking/
//  http://www.abovecalifornia.com/
//  http://www.journeywest.com/WB/index.html
//  http://www.johann-sandra.com/backpackdir.htm
//  http://www.geocities.com/amytys/
//  http://www.thruhikers.com/
//  http://www.redcompservices.com/AT/
//  http://www.midwesthiker.com/
//  http://www.host33.com/backpack/

oSpider:destroy()