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What I want to do is to have a searchfield on an emty html form. When I put in a search word in this field and click search I want to search an entire website (for instance http://ezinearticles.com) looking for an article on the word I entered in the search field. If an article should be found I want to return the URL for that article.
Is it that difficult? Have you looked at the documentation?
You can loop through directory listing in you site, load the file contents and do string matching. But the whole point of indexing is that it makes it reasonably fast.